DB/Spell: Delete no longer needed hack

By unholychick
DB/Spell: Do not let Ebon Plague stack from different casters

Closes #12314
Updates #1818
By unholychick
Update README.md
Core/Misc: Fix current player state when logging out

Sit should only be apply'd when player is standing.
For example when sitting on a chair when logging out, player should stay on the chair until fully logged out and not sit on the floor.
DB/SAI: Prevent endless loops with linked events
Revert bfc6044
DB/Loot: Xandivious (15623)
Core/Maps: Apply const-correctness to GridMap::loadData()
DB/Loot: Xandivious (15623) - forgot item 12002

Thanks @Aminxhm
Merge pull request #13321 from Kittnz/unit_state

Core/Misc: Fix current player state when logging out
DB/SAI: Prevent infinite loop

Just another brick in the wall... thanks @cr4st
DB/Texts: Added missing creature texts to uncomplete fixes
Core/Movement: Fix evade issue

Fix evade issue happening when an evading creature assists another one, causing it to stay in evading state forever.
Fix #4943
Scripts/Icecrown Citadel: Register Rotface's summons so they can be despawned later
Readme: Small restyle to Bountysource badge

See http://www.trinitycore.org/f/topic/10564-bountysource-get-paid-for-fixes/
Merge pull request #13327 from Nyeriah/patch-3

Scripts/ICC: Register Rotface's summons so they can be despawned later
Scripts/ToC: fixed typo introduced in cfc0c50b5e3bc84310417c5146ce0d5901e39fc5
* also update anub arak position to sniffed values

Closes #13323
DB/Misc: Chill Nymph's Do Not Speak in Common

Dont know why some of the texts used by 23678 (Chill Nymph) had language 7 when both in Broadcast text and in sniff these are language 0
Core/Spells: Fix Ebon Plague and Wandering Plague

Ebon Plague fix by @Unholychick
Wandering Plague fix by @tobmaps
Thanks to @maxxx for Ebon Plague correction.
Core/LootMgr: improved logs of missing *_loot_templates