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/BGAnimation.cpp

@@ -172,13 +172,13 @@ void BGAnimation::LoadFromAniDir( CString sAniDir )
 			ActorScroller::SetDestinationItem( int(m_SubActors.size()-1+fItemPaddingEnd) );
 		}
 
-		CString InitCommand;
-		if( ini.GetValue( "BGAnimation", "InitCommand", InitCommand ) )
+		CString sInitCommand;
+		if( ini.GetValue( "BGAnimation", "InitCommand", sInitCommand ) )
 		{
 			/* There's an InitCommand.  Run it now.  This can be used to eg. change Z to
 			 * modify draw order between BGAs in a Foreground.  Most things should be done
 			 * in metrics.ini commands, not here. */
-			this->Command( InitCommand );
+			this->Command( ParseActorCommands(sInitCommand) );
 		}
 	}
 	else