Scripts/Quest: Fix "Massacre At Light's" after recent vehicle changes and drop some silly code

Closes #9448
Merge pull request #9632 from joschiwald/scriptfix

Scripts/Quest: Fix "Massacre At Light's" after recent vehicle changes an...
Script/SAI: Remove Shadow's Edge on completing 'Shadowmourne...'

Closes: #9600
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
Core/Log: Added more information to log when a map cant be created.
Core/Events: announce event system improvement.
Merge pull request #9648 from xjose93/ImproveLog

Core/Log: Added more information to log when a map cant be created.
DB/Quests Fix Mission: Eternal Flame, closes #6852
Script/SAI: Fix runtime error. Thanks @Kirkhammett

Closes #9653

(Can not commit for other authors using the web interface...)
Merge pull request #9647 from xjose93/GameEventAnnounce

Core/Events: announce event system improvement.
Fix some creature text runtime errors
Core/Dependencies: Upgrade to jemalloc-3.3.1 (Also fixes a few weird crashes), closes #7852
Note: This adds support for using jemalloc on FreeBSD, Mac OS X Lion and a few other platforms (not enabled by default)
Please read dep/jemalloc/ChangeLog for further information (Changed from 2.1.1 and up apply)
Core/Spells: Fix dynobj aura stacking
DB/SAI: Missing event flags now added

Closes #9668