[9062] Implement two helper-functions for casting spell in creatureAI.

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<pre>m src/game/CreatureAI.cpp
m src/game/CreatureAI.h
m src/shared/revision_nr.h

[9062] Implement two helper-functions for casting spell in creatureAI.

Function will return a cast result, with fail reasons if spell can not be casted (can be used to take alternative action). Please note this is not a full list of cast fail errors/reasons, but will cover a few basic errors that may occur.
The virtual function CanCastSpell() may be adjusted for custom needs from script library if not the default is sufficient.

Signed-off-by: NoFantasy <nofantasy@nf.no></pre>



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