This PR replaces carps and sharks sprites. by thread https://forums.aurorastation.org/topic/11503-space-carpspace-shark-aesthetic-change/
Replaces carp/shark sprites
Moves shark sprites into animal.dmi file. Removes spaceshark.dmi
Old sprites of carp and shark remain. Also made a new mobs that uses old carp and shark sprites
Moves all NPC sprite files into icons/mob/npc folder, for organization.
Updates all paths.