Adds a couple of lore themed mercenary gear loadout (#6644)

Adds a bit of what is related here: https://forums.aurorastation.org/topic/11941-antagonist-rework-20/

Pretty much, adds a couple of gear crates that mercenary teams, seeking to do a lore related gimmick, can buy by pooling their crystals. Right now, it is just adds a couple of human related factions, such as eridani, sol alliance, elyra and the frontier.

code/modules/projectiles/ammunition/boxes.dm

@@ -426,3 +426,19 @@
 	name = "ion slug box"
 	icon_state = "empslugbox"
 	ammo_type = /obj/item/ammo_casing/gauss/emp
+
+
+/obj/item/ammo_magazine/plasma
+	name = "heavy duty plasma cell"
+	icon_state = "heavy_plasma_cell"
+	mag_type = MAGAZINE
+	caliber = "plasma slug"
+	ammo_type = /obj/item/ammo_casing/plasma_slug
+	max_ammo = 10
+
+/obj/item/ammo_magazine/plasma/light
+	name = "small plasma cell"
+	icon_state = "light_plasma_cell"
+	caliber = "plasma bolt"
+	ammo_type = /obj/item/ammo_casing/plasma_bolt
+	max_ammo = 30

code/modules/projectiles/ammunition/bullets.dm

@@ -273,4 +273,18 @@
 	name = "ion slug"
 	desc = "A heavy ion gauss slug."
 	icon_state = "empslug"
-	projectile_type = /obj/item/projectile/ion/gauss
+	projectile_type = /obj/item/projectile/ion/gauss
+
+/obj/item/ammo_casing/plasma_slug
+	name = "plasma slug"
+	desc = "A plasma slug."
+	icon_state = "plasmaslug"
+	caliber = "plasma slug"
+	projectile_type = /obj/item/projectile/plasma
+
+/obj/item/ammo_casing/plasma_bolt
+	name = "plasma bolt"
+	desc = "A plasma bolt."
+	icon_state = "plasmabolt"
+	caliber = "plasma bolt"
+	projectile_type = /obj/item/projectile/plasma/light

code/modules/projectiles/guns/projectile/plasma.dm

@@ -0,0 +1,36 @@
+/obj/item/weapon/gun/projectile/plasma
+	name = "plasma shotgun"
+	desc = "A marvel of Elyran weapons technology which utilizes superheated plasma to pierce thick armor with gruesome results."
+	icon_state = "slammer"
+	item_state = "slammer"
+	w_class = 3
+	origin_tech = list(TECH_COMBAT = 3, TECH_MATERIAL = 3)
+	ammo_type = /obj/item/ammo_casing/plasma_slug
+	magazine_type = /obj/item/ammo_magazine/plasma
+	allowed_magazines = list(/obj/item/ammo_magazine/plasma)
+	caliber = "plasma slug"
+	fire_sound = 'sound/weapons/gunshot/slammer.ogg'
+	load_method = MAGAZINE
+	handle_casings = DELETE_CASINGS
+	fire_delay = 8
+
+/obj/item/weapon/gun/projectile/plasma/update_icon()
+	..()
+	if(ammo_magazine)
+		icon_state = "[initial(icon_state)]"
+	else
+		icon_state = "[initial(icon_state)]-empty"
+
+
+/obj/item/weapon/gun/projectile/plasma/bolter
+	name = "plasma bolter"
+	desc = "A miniaturized, less efficient version of the infamous plasma slammer. Sacrifices much of its power for a more compact frame."
+	icon_state = "bolter"
+	item_state = "bolter"
+	w_class = 2
+	ammo_type = /obj/item/ammo_casing/plasma_bolt
+	magazine_type = /obj/item/ammo_magazine/plasma/light
+	allowed_magazines = list(/obj/item/ammo_magazine/plasma/light)
+	caliber = "plasma bolt"
+	fire_sound = 'sound/weapons/gunshot/bolter.ogg'
+	fire_delay = 6

code/modules/projectiles/projectile/special.dm

@@ -274,3 +274,19 @@
 
 /obj/item/projectile/magic/teleport/proc/blink_mob(mob/living/L)
 	do_teleport(L, get_turf(L), blink_range, asoundin = 'sound/effects/phasein.ogg')
+
+/obj/item/projectile/plasma
+	name = "plasma slug"
+	icon_state = "plasma_bolt"
+	damage = 25
+	damage_type = BRUTE
+	check_armour = "energy"
+	incinerate = 10
+	armor_penetration = 20
+	penetrating = 1
+
+/obj/item/projectile/plasma/light
+	name = "plasma bolt"
+	damage = 10
+	armor_penetration = 10
+	incinerate = 5