Replacing carp/shark sprites. (#6121)

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.

code/modules/organs/subtypes/diona.dm

@@ -224,7 +224,7 @@
 	name = "nutrient channel"
 	parent_organ = "chest"
 	organ_tag = "nutrient channel"
-	icon = 'icons/mob/alien.dmi'
+	icon = 'icons/mob/npc/alien.dmi'
 	icon_state = "claw"
 
 /obj/item/organ/diona/nutrients/removed()
@@ -234,7 +234,7 @@
 	name = "response node"
 	parent_organ = "head"
 	organ_tag = "response node"
-	icon = 'icons/mob/alien.dmi'
+	icon = 'icons/mob/npc/alien.dmi'
 	icon_state = "claw"
 
 /obj/item/organ/diona/node/removed()

code/modules/organs/subtypes/parasite.dm

@@ -1,6 +1,6 @@
 /obj/item/organ/parasite
 	name = "parasite"
-	icon = 'icons/mob/alien.dmi'
+	icon = 'icons/mob/npc/alien.dmi'
 	icon_state = "burst_lie"
 	dead_icon = "bursted_lie"