Replace scrollbar {up,dn}Button macros with methods.
Name scrollbar struct and remove typedef.
Move leftptr_cursor from rxvt_term to scrollBar_t.
Revert 2007-12-29 change and move scrollbar_len from rxvt_term to scrollBar_t.
Remove pointless macro.
Move last_{bot,top,state} from rxvt_term to scrollBar_t.
Move scrollbar_align from rxvt_xterm to scrollBar_t.
Remove use of isupper.
Remove unused macro.
Rename 'sb_shadow' scrollBar_t field to 'shadow'.
Move sb_shadow from rxvt_vars to scrollBar_t.
Move scrollbar definitions from rxvt.h to its own header.
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