Use only base class of Power-Up

Remove the class that innherited from PowerUp (ExtraBall, BiggerPad...)
as they didnt do anything the base class couldnt do
Merge
Moved logic from ObjectManager to PowerUp

Also did some cleanup for functions that didn't get used
Merge
WindowsSize  removed from PowerUp

PowerUp use position from blackhole instead of the middle now
BOObjectManager has been cleaned