Fix OSC responses with 7-bit ST

Bug reported by Stuart Henderson.

Unbundle libptytty

Make rxvt_failure_exception inherit from std::exception

Fix typos

sanctified by exg

allow non-bmp characters even without --enable-unicode3, which I thought had already been done, but wasn't. probably breaks tons of stuff

editorial changes

Improve naming of extended mouse private mode constants

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Add extension autoloading based on resources.

24-bit color cube collision avoidance (patch by Fengguang Wu)

When the color cube slot is found to be already occupied by a similar
24-bit color, search through the -1, 0, +1 R/G/B indices trying to find
an empty slot, or the oldest used one (which hopefully is no longer in
active use).

This effectively reduces random collisions, hence make it pretty hard to
hit a vim GUI color scheme that cannot be correctly showed in urxvt.

24-bit direct color support (patch by Fengguang Wu)

Support directly setting RGB fg/bg colors via ISO-8613-3 24-bit
ANSI color escapes:

  ESC[38;2;<r>;<g>;<b>m Select RGB foreground color
  ESC[48;2;<r>;<g>;<b>m Select RGB background color

The killer applications for me are vim in tmux. It'll not only modernize
their look and feeling, but also bring more eye friendly color schemes.
Very helpful for long time programmers.

To avoid memory overheads and keep the patch non-intrusive, it takes the
approach to adapt the nearest color in an hidden 6x6x4 (88-color mode)
or 7x7x5 (256-color mode) color cube to the new 24-bit RGB color.

The pros/cons are:

+) least memory footprint (close to 0)
   comparing to konsole, gnome-terminal etc. real 24-bit arrays

+) exact colors and excellent user feelings
   comparing to xterm, mlterm, etc. approximating to 256 palette

+) usable in both the existing 88/256-color modes

   Most vim GUI color schemes show up the same as gvim in rxvt-unicode's
   88-color mode, not to mention the 256-color mode. Typical applications
   only use one or two dozens of colors at the same time.

-) may not be able to show 2+ close 24-bit colors

   RGB colors close to each other will likely fall into the same slot in
   the 6x6x4 or 7x7x5 color cube. If necessary, it could be improved
   effectively by implementing some collision avoidance logic, trying to
   find empty/eldest slot in the +1/-1 r/g/b indices (ie. 3-8 neighbors).

The CPU overheads of map_rgb24_color() look ignorable: I feel no
perceptible slow down when doing vim operations in 24-bit color mode.

A micro benchmark running a test script from [1]:

% time (for i in {1..100}; do 24-bit-color.sh; done)

vanilla rxvt-unicode
====================
  2.42s user 1.88s system 31% cpu 13.555 total
  2.59s user 1.74s system 31% cpu 13.615 total
  2.46s user 1.85s system 31% cpu 13.631 total

THIS PATCH (adapt hidden color cube to 24-bit)
==============================================
  2.33s user 1.97s system 31% cpu 13.598 total
  2.46s user 1.89s system 31% cpu 13.613 total
  2.51s user 1.82s system 31% cpu 13.556 total

https://github.com/spudowiar/rxvt-unicode (real 24-bit array)
=============================================================
  2.61s user 1.75s system 31% cpu 13.721 total
  2.48s user 1.82s system 31% cpu 13.566 total
  2.60s user 1.76s system 31% cpu 13.631 total

USE_256_COLORS is defined in all the above rxvt-unicode builds.

References:

[1] True Colour (16 million colours) support in various terminal
    applications and terminals
    https://gist.github.com/XVilka/8346728

[2] https://en.wikipedia.org/wiki/ANSI_escape_code#Colors

Bail out if --disable-resources is given and either frills or perl is enabled.

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Fix optimization in refresh for cells containing a space.

scr_refresh skips refresh for cells containing a space and whose
rendition attributes defining the bg color have not changed. However,
the computation of such attributes erroneously assumes that, if reverse
video is set, the bg color is given by the fg color, which is not true
in the case where bg == fg. This causes cells with a space and bg == fg
not being refreshed also when the reverse video attribute has changed,
as observed in red hat bug #830236. Fix the bug by amending the
attributes test so that the refresh of such a cell is performed if the
reverse video attribute has changed.

Use XGetKeyboardMapping instead of XKeycodeToKeysym.

Add DECSCUSR xterm extension to set the cursor to a vertical bar.

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Fix last change.

Add tt_write wrapper for user input and use it for 'string:' actions.

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Fix build with --disable-transparency --disable-perl.

if it breaks, the pieces will be sharp

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Add shade operator to rxvt_img.

Simplify.

Get rid of BG_IS_VALID flag.

Properly manage BG_IS_TRANSPARENT flag in core bg image code.

Revise preprocessor macros that control the core bg image code.

Move definition of BG_IMAGE_FROM_FILE in rxvt.h and add analogous
BG_IMAGE_FROM_ROOT macro that is set if the code to manage the root
pixmap is needed.

Revert refactoring no longer needed.

Do not abort if loading an image with OSC 20 fails.

Switch background.C to rxvtimg api (xrender is now required).

Change bg_render return type to void.

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Move get_pixmap_property to rxvt_display.

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Rename method.

Refactor tint/blur variables and methods into a new image_effects
object, so as to be able to apply such effects to multiple images.

add some ecb_hot/ecb_cold

use one big chunk for all line_t's and rend/text data, get rid fo salloc

Revert back to manual deallocation for pixbufs.

There is no simple way to use auto_ptr with custom deallocators.

Factor the code to parse a boolean resource and to find all the
resources matching a given prefix into new methods.

Simplify.

mikachuopt

Renumber bg enum constants and shrink bg_flags.

Refactor code to manage images from files into a new rxvt_image object,
so as to be able to load multiple images.

Simplify.

Fix disabling of cursor blink with the option-popup menu.

Based on a patch by Jan Larres.

Simplify.

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Use a temporary pixmap to apply blur with xrender.

Using the same pixmap as source and destination drawable is not valid
apparently.

Remove unused member.

Add a flag to check if the terminal init is completed, rather than
abusing env_colorfgbg.

Remove write-only variables.

Simplify.

Move parsing of '-e' option in get_options.

Fixes options parsing when '-e' occurs as an option argument, such as in
'urxvt -title -e'.

Rename 'pscale' and 'root' pixmap operations to 'keep-aspect' and 'root-align', respectively.

Add on_register_command hook and register_command method.

Revert 2011-08-21 change.

The 'focus' and 'mapped' perl accessors assume that the corresponding
variables have type int and it is not worth changing.

Use bool for boolean variables.

Remove camelcase in some function names.

Migrate to libecb.

Cleanup.

Change type of 'parent' from array of Window to Window as all the
elements except the first are unused.

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Factor the code to request a selection property into a new toolkit-level
object.

The return type of ev_now is ev_tstamp, not double.

Change 'have_image' boolean to a flag.

Remove bgPixmap_t struct, move background pixmap handling in rxvt_term.

Generalize rxvt_splitcommastring to accept any char as delimiter and
optimize it to use a single memory area for the strings.

Revert part of last change.

Simplify.

make set_options non-inline for total win-win-win-lose

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Move code to set icon image to a new method.

Fix typos.

Remove unused function.

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some constants

Add OSC 19 to change highlightTextColor.

Disable colorRV resource.
Make OSC 17 apply to highlightColor.
Make highlightColor apply also to selected cells with reverse video.
Add highlightTextColor resource to change the foreground colour of
highlighted characters.

Remove unused variable.

Add terminfo entry for rxvt-unicode with support for 256 colors.

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256-color support.

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Fix typos.

Remove unused fallback.

Fix wording.

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Replace references to nsaved with top_row.

Lowercase function name.

Make scrollbar_{resize,mapping,show} methods of scrollBar_t.

Rename PrivMode to set_privmode and switch arguments order.

Remove unused macros.

Always compile in plain style scrollbar.

Disable continual scrolling code when rxvt and next styles are not
requested.

Deprecate OSC 39/49.

Move rxvt_term::init to init.C.

Move last_{bot,top,state} from rxvt_term to scrollBar_t.

Remove scrollbar_len from rxvt_term and make it a local variable in
scrollbar_show.

Remove ttymode_t typedef.

Make pix_colors_{focused,unfocused} arrays non dynamic.

Fix comment.

Reorder declarations.

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Remove leftover.

Change init_vars return type to void, it always returns true.

Minor reordering.

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Do not compile in the block builtin graphics with --disable-frills.

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Cosmetics.

Fix typo.

Nuke rxvt_strdup.

Implement 1002/1003 mouse tracking modes.

Declarations reordering.

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Make x_resource a static function.

renamed xpm.C to background.C and moved bgPixmap stuff out of rxvt.h

Remove useless indirection for {backspace,delete}key resources.

Remove unused function.

Remove unused function.

Make the PrivMode macro a method.

Preliminary implementation of tinting/shading using XRender. TODO add proper detection of XRender to configure, as XFT may be present without XRender

reimplemted delayed rendering of the background pixmap with some logic to use different timeouts for different rendering algorithms

fixed compilation bugs without libAI, added setters to bgPixmap for transparency params and moved server side tinting to make_transparency_pixmap; started refactoring check_our_parents into render_background()

made target a part of bgPixmap, moved set background calls into a separate function; started writing a function for generating transparency pixmap - that code should come out of check_parents()

fleshed out new render_asim function to be generic enough so it can be used with both transparent blended and non-transparent code

implemented hopefully better parsing of the geometry string

updated comments explaining pixmap geometry string; added differentiation between HAVE_AFTERIMAGE and XPM_BACKGROUND; began moving background handling functions under bgPixmap_t - work in progress

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fixed libAI usage for multi-display  - requires new libAfterImage from CVS - version 1.15

Fixed libAfterImage support when multiple displays are used. Added documentation for --enable-afterimage configure flag

TRANSPARENT => ENABLE_TRANSPARENCY rename to avoid symbol conflict
on solaris..

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- document some new bugs.
- document changes.
- improve configure for afterimage.
- fix type.
- some indenting.

remove OPTION macro

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made use of new callback.h syntax

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Revert last change.

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