[TW279] - Core/Battlegrounds: Increase AV frequency

Allows AV to start if last BG was at least 13v13. Also prevents starting a second AB, EotS or SotA. AV will start instead.
Scripts/Ruby Sanctum: Fixed Halion engaging combat outside of his Flame Ring.
Core/GameObjects: Fix crash with Summoning Ritual GOs

Fix a crash happening with GAMEOBJECT_TYPE_SUMMONING_RITUAL GameObjects if a Player clicked on the GO, logged out and let another Player click on it.
Issue added in 464c0c16116dfd22b3c104165ce6edd7b7f4a3d4
Fixes #11856
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
Merge branch 'master' of https://github.com/TrueWoW/TrinityCore into ghbb

Conflicts:
	src/server/game/Battlegrounds/BattlegroundMgr.cpp