Core/Scripts: Remove script from old boss

http://www.wowwiki.com/Highlord_Kruul
This creature was part of a bc event. he is no longer part of the game
Merge pull request #12417 from gerripeach/remove_old_boss

Core/Scripts: Remove script from old boss
DB/Misc: Chromie at begining of The Culling of Stratholme

By w1sht0l1v3, updates #5516
[TW336] - Core/Battlegrounds: Lower the AFK tolerance timer to 3 minutes up from 5

This reverts commit 0b4d9e14551d829367a67c92395ea3d395530302.
Merge branch 'master' of https://github.com/TrueWoW/TrinityCore into ghbb
更新
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
DB/Creature: Opus must have 4 random models

Closes #12404
DB/Creature: Update some wrong creature_template_addon
Core/Instances: Enable automatic changing dungeon difficulty to a lower one when currently selected difficulty does not exist for entered instance
Fix typo on 077c6e1
Fix typo on bb8922a
Core/Battleground:
* added a possibility to reload battleground templates
* cleaned up the template structure
* use mapids from BattlemasterList.dbc to calculate random bg
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb

Conflicts:
	src/server/game/Battlegrounds/Battleground.cpp
	src/server/game/Battlegrounds/BattlegroundQueue.cpp