added limitation of evertims elements (room, source, etc.) to one per type when creating elmt from selected Blender object. (+ code ready for single {room, logic} limitation AND {source, listener} auto numbering)
added limitation of evertims elements (room, source, etc.) to one per type
when creating elmt from selected Blender object.
(+ code ready for single {room, logic} limitation AND {source, listener}
auto numbering)

EVERTims/game_engine_evertims