[9598] update battlegrounds per map + cleanup at delete

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<pre>m src/game/BattleGround.cpp
m src/game/BattleGround.h
m src/game/BattleGroundMgr.cpp
m src/game/BattleGroundMgr.h
m src/game/Map.cpp
m src/game/Map.h
m src/shared/revision_nr.h

[9598] update battlegrounds per map + cleanup at delete

this will be useful, if we have multithreaded mapupdates one day

since i couldn't reproduce any errors regarding to self deletions of
battlegrounds i removed the m_deleteThis variable</pre>



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