Added a way for us to add mobsprites for items unique to UMcS.
Merge branch 'master' into spritefix

Conflicts:
	icons/mob/items_lefthand.dmi
	icons/mob/items_righthand.dmi
Cleaned and optimized the sprite fix.
Added in Nienhaus's police tape sprite fix
Merged policetape.dmi into uristicons.dmi
Merge pull request #46 from CoZarctan/spritefix

UMcS Mobsprites Fix