[9892] Cleanups for BattleGroundEY code
 

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

[9892] Cleanups for BattleGroundEY code

Signed-off-by: VladimirMangos <vladimir@getmangos.com>

Also prevent send uninitilized mark data in case BATTLEGROUND_EY end.
Simplify related code.</pre>



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