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().
LIBRARY "openalbridge"
EXPORTS
openal_init
openal_close
openal_ready
openal_loadfile
openal_playsound
openal_pausesound
openal_stopsound
openal_playsound_loop
openal_stopsound_free
openal_freesound
openal_toggleloop
openal_setvolume
openal_setglobalvolume
openal_togglemute
openal_fade
openal_fadein
openal_fadeout