Particle object and handler created
Particle Handler added into level
Particle images added to game atlas
Added bubble particle effect to ufo
Made it so projectiles can have smoke trails
Made missile smoke trail look better

Added smoke trail to stinger npc.
Fixed particle bug.
Made the sound asset list into a markdown file
Ground no longer has light drawn over it
Projectile clean up

Removed unused methods.
Removed unused/unneeded variables.
Fixed the overloaded methods.

I removed all the extra constructors because I plan on making a better
way for the weapons to define their projectiles so the constructors will
not be needed.
A few other projectile changes I missed
Weapons now use projectile* instead of a template

This will help us give the weapons more dynamic projectiles.
ProjTemplate removed from source
Readme and Design doc updates
More readme updates
Added cow command to readme
Removed proj temp header from weapon
Made level 1 bigger with more cows
Abduct ray now limited by energy

This will balance out the ufo so you can't just abduct constantly.
NPC's no longer draw if offscreen
Title & Description added to level button