Corrected lighting and Michi's fade thing.

Also made deathtime work in seconds. I learned that multiply blending
wasn't what I thought it was.
Saved circle image in right place.

Explains a lot....
Made sandbox mode a different gamestate.

Pressing 's' to switch no longer works, but I prefer it that way.
Also did tons of stuff I'm either forgetting or too lazy to write.
Merge branch 'master' into ghosticle

Conflicts:
	game.lua