Tons of stability improvements to threading of parallel connection.

changed name of variables and functions to reflect more what they do.
removed obsolete functions.
parallel connection is no longer in contact with main thread unless to be deleted

src/engine/openspaceengine.cpp

@@ -638,7 +638,6 @@ void OpenSpaceEngine::preSynchronization() {
 		Time::ref().preSynchronization();
 		
         _interactionHandler->update(dt);
-        _parallelConnection->update(dt);
         //_interactionHandler.lockControls();		
 
 		_scriptEngine->preSynchronization();