[10242] Rewrite internal work chat command system.

[newsbot]

<pre>m src/game/Chat.cpp
m src/game/Chat.h
m src/game/ChatHandler.cpp
m src/game/Level0.cpp
m src/shared/revision_nr.h

[10242] Rewrite internal work chat command system.

* Use single command search function with recursion and reuse it in now more
simple
and consistent for execute/help/loading
* Add intergiry checks for hardcoded part of commands list. Fix some cases base
at it.
* Fixed diff small problems in past code:
- in console single symbol commands rejected (without dot start)
- .help not output propertly subcommands list for not found subcommand
- some other...</pre>



Дальше...