Scripts/Commands: mod xp command

Closes #13476
Core/Player: Fix Cosmetic Auto-Repeat Bug

Closes #13532
Fixes #12436
DB/Quest: Sniffing Out the Perpetrator (Alliance)

By @gecko32

Closes https://github.com/TrinityCore/TrinityCore/issues/991
DB/Quest: Blending In

* Credit now given the proper way using areatriggers rather than using ooc los on npcs result, credit is now given wether or not player is wearing shroud rather than only working if player does not use shroud as the credit npc cannot see shrouded player
* Added the Detect Shrouded Player to En'kilah Abomination so these are now visible to shrouded players and will attack

Closes https://github.com/TrinityCore/TrinityCore/issues/10227
DB/Quest: Flight of the Wintergarde Defender

1) Add missing Helpless Wintergarde Villagers and associated updates for these
2) Script quest, based on original work by @Rushor
3) Fixed credit for rescueing villagers as this did not work in original script and added wintergarde mine to areas where gryphon is allowed to be flown as the tooltip for the mount states thats its allowed there

Closes https://github.com/TrinityCore/TrinityCore/issues/4175
Script/Spells: fixed crash in spell_hun_aspect_of_the_beast

Closes #13560
Merge branch '3.3.5' of https://github.com/TrinityCore/TrinityCore into 3.3.5