Adds incendiary shotgun shells available via hacked autolathes in a new subclass of incendiary bullets and gave chemical dart shells their own sprites.

Conflicts:
	code/game/machinery/autolathe.dm
	code/game/mecha/equipment/weapons/weapons.dm
	code/modules/projectiles/ammunition/bullets.dm
	code/modules/projectiles/projectile/bullets.dm
	icons/obj/ammo.dmi