[10322] In chat command handlers use char* arg instead "const char*"

[newsbot]

m src/game/Chat.cpp

m src/game/Chat.h

m src/game/Level0.cpp

m src/game/Level1.cpp

m src/game/Level2.cpp

m src/game/Level3.cpp

m src/game/debugcmds.cpp

m src/mangosd/CliRunnable.cpp

m src/shared/revision_nr.h



[10322] In chat command handlers use char* arg instead "const char*"



We in any case modify args string content at parsing in commands,

so cast it to char* early. This let avoid lot later casts.



Some other code style exist in related code.

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