UNIT SPELLCAST SENT

Fired when a unit attempts to cast a spell regardless of the success of the cast.
 UNIT_SPELLCAST_SENT: unit, target, castGUID, spellID
==Payload==
:;unit: : UnitId - Only fires for "player"
:;target: : UnitId
:;castGUID: : GUID - e.g. for Flare (Spell ID 1543) "Cast-3-3783-1-7-1543-000197DD84"
:;spellID:
==Details==
* Fired when a unit tries to cast an instant, non-instant, or channeling spell even if out of range or out of line-of-sight (unless the unit is attempting to cast a non-instant spell while already casting or attempting to cast a spell that is on cooldown).
==Patch changes==