Unfolded pAIs can be picked up

Because who doesn't want a robotic cat on their head? Adds in the missing code to allow pAIs to actually be picked up, and held sprites for the newer 4 chassis options.

code/modules/mob/holder.dm

@@ -95,6 +95,9 @@ var/list/holder_mob_icon_cache = list()
 /obj/item/weapon/holder/drone
 	origin_tech = list(TECH_MAGNET = 3, TECH_ENGINEERING = 5)
 
+/obj/item/weapon/holder/pai
+	origin_tech = list(TECH_DATA = 2)
+
 /obj/item/weapon/holder/mouse
 	w_class = ITEMSIZE_TINY
 

code/modules/mob/living/silicon/pai/pai.dm

@@ -1,12 +1,14 @@
 /mob/living/silicon/pai
 	name = "pAI"
 	icon = 'icons/mob/pai.dmi'
-	icon_state = "repairbot"
+	icon_state = "pai-repairbot"
 
 	emote_type = 2		// pAIs emotes are heard, not seen, so they can be seen through a container (eg. person)
 	pass_flags = 1
 	mob_size = MOB_SMALL
 
+	holder_type = /obj/item/weapon/holder/pai
+
 	can_pull_size = ITEMSIZE_SMALL
 	can_pull_mobs = MOB_PULL_SMALLER
 
@@ -23,16 +25,16 @@
 	var/obj/item/device/radio/radio		// Our primary radio
 	var/obj/item/device/communicator/integrated/communicator	// Our integrated communicator.
 
-	var/chassis = "repairbot"   // A record of your chosen chassis.
+	var/chassis = "pai-repairbot"   // A record of your chosen chassis.
 	var/global/list/possible_chassis = list(
-		"Drone" = "repairbot",
-		"Cat" = "cat",
-		"Mouse" = "mouse",
-		"Monkey" = "monkey",
-		"Corgi" = "borgi",
-		"Fox" = "fox",
-		"Parrot" = "parrot",
-		"Rabbit" = "rabbit"
+		"Drone" = "pai-repairbot",
+		"Cat" = "pai-cat",
+		"Mouse" = "pai-mouse",
+		"Monkey" = "pai-monkey",
+		"Corgi" = "pai-borgi",
+		"Fox" = "pai-fox",
+		"Parrot" = "pai-parrot",
+		"Rabbit" = "pai-rabbit"
 		)
 
 	var/global/list/possible_say_verbs = list(
@@ -416,7 +418,8 @@
 	var/obj/item/weapon/holder/H = ..(grabber, self_drop)
 	if(!istype(H))
 		return
-	H.icon_state = "pai-[icon_state]"
+
+	H.icon_state = "[chassis]"
 	grabber.update_inv_l_hand()
 	grabber.update_inv_r_hand()
 	return H