DB/SAI: add SAI for The Light's Mercy

Closes #9364
DB/Creature: add a text on death for Overmaster Pyron

Closes #9267
DB/Creature: add missing Silver Convenant in Frozen Halls

Closes #9082
DB/SAI Update SAI  param for Ruined lifeboat & add SAI for Negolas

Closes #8846
DB/Creature: Add missing spawns in the Demon Fall Ridge area

Closes #8614
fix wrong pointid in previous commit
DB/Spell: Fixed EFFECT BIND position for "Teach: Death Gate".

Ref #8590
DB/EAI: Fix db error in 3a5ed66dcd08bbca276b87ee4f2bc94c403bda21
DB/Quest: set correct class requirement for The Forging of Quel Serrar

Closes 4194