Pass ActorCommand structures to Actor instead of unparsed command strings.

This way, we can potentially do the parsing early and not parse inside of Actor as the command is executing.

stepmania/src/ActorFrame.cpp

@@ -67,7 +67,7 @@ void ActorFrame::DrawPrimitives()
 		m_SubActors[i]->Draw();
 }
 
-void ActorFrame::RunCommandOnChildren( const CString &cmd )
+void ActorFrame::RunCommandOnChildren( const ActorCommands &cmd )
 {
 	for( unsigned i=0; i<m_SubActors.size(); i++ )
 		m_SubActors[i]->Command( cmd );