[9388] Implement max cast chain length for triggered spells.

[newsbot]

<pre>m src/game/Spell.cpp
m src/game/Unit.cpp
m src/game/Unit.h
m src/game/World.cpp
m src/game/World.h
m src/mangosd/mangosd.conf.dist.in
m src/shared/revision_nr.h

[9388] Implement max cast chain length for triggered spells.

* New config option MaxSpellCastsInChain ( 0 is disabled old way work )
* Check added for prevent stack overflow crashes in case infinity triggered casts sequences
with more useful error output instead crash.
* Default config steeing in 10 casts expected to allow all possible in game proper cast chains.</pre>



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