DB/Misc: 2 updates to fix non working SAI scripts

Closes #9460
DB/Misc: Doing this out of the kindness of my heart, not because @Aokromes forced me into slavery.

Closes #9624
Script/SAI: Convert Arzeth the Merciless to SAI
Script/SAI: Fix runtime errors
Rename sql files from previous commit and add new line at eof
Core/Buildsystem: Actually follow CONF_DIR path-directive when installing configuration-files on UNIX
Fixes issue #9649
DB/Quests: Fix The Leaders at Jin'Alai, closes #902

Remove some double spawns
Add some missing spawns
Convert some EAI to SAI
Add some visual effects for quest Breaking Through Jin'Alai
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore