Core/PetitionsHandler: Move charter costs to config
Scripts/Nexus: rewritten instance script
Scripts/Nexus: Implement Grand Magus Telestra's seasonal costume

Closes #13643
Merge pull request #13749 from mthsena/3.3.5

Core/PetitionsHandler: Move charter costs to config
Core/Scripts: Add new SpellScript hook OnEffectSuccessfulDispel

Adds SpellScript hook to execute scripts after succesful dispels, example could be warlock pets Devour Magic, which should only trigger when succesfully dispelling an aura.

(cherry picked from commit ebf95e7ed7f518c54d9c4044e050d50e0dcb0c57)

Conflicts:
	src/server/game/Spells/SpellEffects.cpp
Merge branch '3.3.5' of https://github.com/TrinityCore/TrinityCore into ghbb