Add onGameTick20 to try and encourage lua to be a bit more efficient. Rewrite Space Invasion to use it. Top speed of aliens is 25% higher now, although that could be changed, I kinda liked it. Change parameter order of div().

/*
 * Copyright (C) 2008 Remko Troncon
 */

#include "AutoUpdater.h"

AutoUpdater::~AutoUpdater()
{
}