Add cross faction battlegrounds version 27!

Conflicts:
	src/server/game/Battlegrounds/Battleground.cpp
	src/server/game/Battlegrounds/BattlegroundMgr.cpp
	src/server/game/Entities/Player/Player.cpp
	src/server/game/Handlers/BattleGroundHandler.cpp
	src/server/worldserver/worldserver.conf.dist
Fix AB flags Thanks @Raydor closes #4