[10042] Implement CONDITION_QUESTAVAILABLE.

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m src/game/ObjectMgr.cpp

m src/game/ObjectMgr.h

m src/game/Player.cpp

m src/game/Player.h

m src/game/QuestDef.h

m src/shared/revision_nr.h



[10042] Implement CONDITION_QUESTAVAILABLE.



Also do come constatification of quest status check functions

and fix one unsafe use std::map operator[].

Never never use std::map operator [] for _read_ access.

Good chance corrupt related structure state ;)

Not in found case but in general.

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