turns out --game has problems. also update common

src/StepMania.cpp

@@ -1147,14 +1147,6 @@ int main(int argc, char* argv[])
 	INPUTFILTER	= new InputFilter;
 	INPUTMAPPER	= new InputMapper;
 
-	RString argGame;
-	if( GetCommandlineArgument(	"game",&argGame) )
-	{
-		const Game *g = GAMEMAN->StringToGame(argGame);
-		if( g && g != GAMESTATE->GetCurrentGame() )
-			GAMESTATE->SetCurGame(g);
-	}
-
 	StepMania::ChangeCurrentGame( GAMESTATE->GetCurrentGame() );
 
 	INPUTQUEUE	= new InputQueue;