refactor decrease_ob* into ->decrease method.
and one more rename
added decrease_ob_nr to the save environment and added an example to the npc dialogues.
added example for @cond
reorganised documentation and improved it
- use a per-player attachment in dialog code instead of a timer
to detect distance.
- store currently active dialog in $pl->{npc_dialog}
changed word matching in npc dialogs
added state argument to the @trigger npc dialog command.
moved perl extensions into server codebase, where they belong
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