Added Kamakazfly mockup

Added a mockup and illustrator file for the proposed "fly" enemy.
-Travis
Created Kamakazfly sprite for in-game use

Updated the snail-sprite template for a smaller character, as well.
-Travis
Added fly sprite to arc_fly in zero

Added the fly sprite in the game. There is a camera issue on my level,
not sure what exactly that is about.
-Travis