Adds a new PKA to the mining Vendor

Miners are always going and saying that they amass so many points while mining, yet nothing is worthwhile enough to buy with said points so they sit there wasted usually. This adds a new premium Kinetic Accelerator with stronger base stats, meanwhile it costs 8K mining points. Will later be adding premium edition of Kinetic crusher. Ideal goal is to encourage miners to mine enough ore for station to get this gear before they go out to hunt for real.

code/modules/projectiles/guns/energy/kinetic_accelerator.dm

@@ -22,9 +22,44 @@
 
 	var/max_mod_capacity = 100
 	var/list/modkits = list()
-	
+
 	var/recharge_timerid
 
+/obj/item/gun/energy/kinetic_accelerator/premiumka
+	name = "premium accelerator"
+	desc = "A premium kinetic accelerator fitted with an extended barrel and increased pressure tank."
+	icon_state = "premiumgun"
+	item_state = "premiumgun"
+	lefthand_file = 'icons/mob/inhands/weapons/guns_lefthand.dmi'
+	righthand_file = 'icons/mob/inhands/weapons/guns_righthand.dmi'
+	ammo_type = list(/obj/item/ammo_casing/energy/kinetic/premium)
+
+/obj/item/gun/energy/kinetic_accelerator/premiumka/dropped()
+	. = ..()
+	if(!QDELING(src) && !holds_charge)
+		// Put it on a delay because moving item from slot to hand
+		// calls dropped().
+		addtimer(CALLBACK(src, .proc/empty_if_not_held), 1.60)
+
+/obj/item/ammo_casing/energy/kinetic/premium
+	projectile_type = /obj/item/projectile/kinetic/premium
+
+/obj/item/projectile/kinetic/premium
+	name = "kinetic force"
+	icon_state = null
+	damage = 50
+	damage_type = BRUTE
+	flag = "bomb"
+	range = 5
+	log_override = TRUE
+
+/obj/item/gun/energy/kinetic_accelerator/premiumka/update_icon()
+	..()
+	if(!can_shoot())
+		add_overlay("[icon_state]_empty")
+	else
+		cut_overlays()
+
 /obj/item/gun/energy/kinetic_accelerator/examine(mob/user)
 	..()
 	if(max_mod_capacity)