Scripting/Eversong_Woods: Add quest end scripting for quest 8487.
Also fixes for quest 8488 but not completely fixed.
Scriting/Eversong Woods: Minor fix.
Core/Player: Allow questgiver, if npc, to cast quest RewSpellCast & RewSpell rather than player.
DB/SAI: Fix Quest 13145 "The Vile Hold"
Closes #7799
Core/QuestPOI: Replace Unk2 with FloorId