Initial support for multiple charms

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Автор: Warlockbugs

Initial support for multiple charms



* Add underlying storage for more than one simultaneous charm

- Charms are logically split into unique advertised one (aka "public") and multiple non-advertised ones ("private").

- Introduce changes into approriate parts of charm routine to support it

* Significant change in Unit::BreakCharmOutgoing() semantics:

- Introduce override method which breaks all charms or just advertised one

- Existing method no longer has default probe to GetCharm() and requires a unit

* Modify Unit::TakeCharmOf() to allow specifying type of the charm

- Allows charming one advertised (public) and many private charms

* Some cleanup in aura handlers

* Introduce handler for SPELL_AURA_AOE_CHARM

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