Dev: Pull Out Unit SpellCast Controller

[nfet]

New Name: SpellCastController.lua

Reference

wow-addon-actionbar-plus/Core/Lib/Widget/Controllers/ActionBarController.lua

Lines 174 to 178 in 468f2c4

	o[E.UNIT_SPELLCAST_SENT] = OnSpellCastSentAllUnits
	o[E.UNIT_SPELLCAST_START] = OnPlayerSpellCastStart
	o[E.UNIT_SPELLCAST_STOP] = OnPlayerSpellCastStop
	o[E.UNIT_SPELLCAST_SUCCEEDED] = OnSpellCastSucceeded
	o[E.UNIT_SPELLCAST_FAILED_QUIET] = OnPlayerSpellCastFailedQuietly