main menu reduced CPU usage

git-svn-id: http://svn.net-core.org/repos/t-engine4@592 51575b47-30f0-44d4-a5cc-537603b46e54

game/special/mainmenu/class/Game.lua

@@ -45,6 +45,10 @@ function _M:run()
 	self:setCurrent()
 end
 
+function _M:tick()
+	return true
+end
+
 function _M:display()
 	if self.background then
 		local bw, bh = self.background:getSize()

src/main.c

@@ -528,7 +528,6 @@ int main(int argc, char *argv[])
 	while (!exit_engine)
 	{
 		if (!isActive || tickPaused) SDL_WaitEvent(NULL);
-//		else if (tickPaused) SDL_Delay(1000 / 30);
 
 		/* handle the events in the queue */
 		while (SDL_PollEvent(&event))