Core/Spells: Fix dynobj aura stacking
DB/SAI: Missing event flags now added

Closes #9668
DB/Loot: Insert Frozen Orb into The Prophet Tharon'ja's loot template

Closes #9605
DB/Conditions: add correct conditions to Lokhtos Darkbargainer's shop

Closes #9594
Merge https://github.com/TrinityCore/TrinityCore