Mech thermal guns (#90928)

## About The Pull Request

PR adds new unique weapons for mechs - thermal cannons. You can only buy
them in cargo in the "armory" category for 5k, which adds cooperation
between cargo and science (maybe even security, since you need their
access to open the crate).
Thermal guns only work better in pairs, allowing them to reload faster.
You can't have 2 of the same thermal guns (not that you could use them
anyway even if you could install the same ones)

Sprites by: https://github.com/sylvia-from-fulp-station


https://github.com/user-attachments/assets/d78504b9-90b8-4f8b-b850-fa96dd8ef554

## Why It's Good For The Game

Mechs don't need buffs, but a greater variety of weapons. Thermals will
be a good example of combining both energy weapons and ballistic weapons
(which mechs lack so much, since all we have from ballistics is Hades,
which does not damage at all). It will also be, in my opinion, the first
interesting weapon that not only shoots, but also gives some bonuses
when used correctly.

## Changelog


🆑
add: Added heavy thermal guns for mechs. Works on the principle of
regular hand guns. Can only be purchased in cargo, as they are
experimental.
/🆑

code/modules/cargo/packs/security.dm

@@ -379,3 +379,15 @@
 	access_view = ACCESS_SECURITY
 	contains = list(/obj/item/clothing/glasses/sunglasses = 1)
 	crate_name = "sunglasses crate"
+
+/datum/supply_pack/security/armory/mechthermal
+	name = "Heavy Thermal Guns Crate"
+	desc = "Contains two experimental thermal cannons for use by mechs. \
+		When used simultaneously, their excess power used to heat and cool the opposing weapon, \
+		increasing the reload speed."
+	cost = CARGO_CRATE_VALUE * 25
+	contains = list(
+		/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/cryo,
+		/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/inferno,
+	)
+	crate_name = "thermal cannons crate"

code/modules/vehicles/mecha/equipment/weapons/weapons.dm

@@ -165,6 +165,65 @@
 	harmful = TRUE
 	mech_flags = EXOSUIT_MODULE_COMBAT | EXOSUIT_MODULE_WORKING
 
+///Exosuit thermal guns
+
+/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal
+	equip_cooldown = 20
+	name = "\improper Prototype -I 'Thermal Cannon'"
+	desc = "A special prototype of a heavy thermal weapon designed for use on exosuits. This one is debug-chambered."
+	icon_state = "mecha_laser"
+	energy_drain = 50
+	projectile = /obj/item/ammo_casing/energy/nanite
+	fire_sound = 'sound/items/weapons/thermalpistol.ogg'
+	harmful = TRUE
+
+/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/cryo
+	name = "\improper Prototype I 'Cryo Thermal Cannon'"
+	desc = "A special prototype of a heavy thermal weapon designed for use on exosuits. This one is cryo-chambered."
+	icon_state = "mecha_cryogun"
+	projectile = /obj/projectile/energy/cryo
+
+/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/inferno
+	name = "\improper Prototype II 'Pyro Thermal Cannon'"
+	desc = "A special prototype of a heavy thermal weapon designed for use on exosuits. This one is molten-chambered."
+	icon_state = "mecha_pyrogun"
+	projectile = /obj/projectile/energy/inferno
+
+/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/cryo/try_attach_part(mob/user, obj/vehicle/sealed/mecha/themech, attach_right)
+	var/has_molten = FALSE
+	for (var/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/thegun in themech.flat_equipment)
+		if (istype(thegun, /obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/cryo))
+			to_chat(user, span_warning("[themech] already has [thegun] installed!"))
+			return FALSE
+		if (istype(thegun, /obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/inferno))
+			has_molten = TRUE
+	if (has_molten)
+		for (var/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/thegun in themech.flat_equipment)
+			if (istype(thegun, /obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/inferno))
+				thegun.equip_cooldown = 8
+		equip_cooldown = 8
+	return ..()
+
+/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/inferno/try_attach_part(mob/user, obj/vehicle/sealed/mecha/themech, attach_right)
+	var/has_cryo = FALSE
+	for (var/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/thegun in themech.flat_equipment)
+		if (istype(thegun, /obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/inferno))
+			to_chat(user, span_warning("[themech] already has [thegun] installed!"))
+			return FALSE
+		if (istype(thegun, /obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/cryo))
+			has_cryo = TRUE
+	if (has_cryo)
+		for (var/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/thegun in themech.flat_equipment)
+			if (istype(thegun, /obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/cryo))
+				thegun.equip_cooldown = 8
+		equip_cooldown = 8
+	return ..()
+
+/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/detach(atom/moveto)
+	for (var/obj/item/mecha_parts/mecha_equipment/weapon/energy/thermal/thermal_gun in chassis.flat_equipment)
+		thermal_gun.equip_cooldown = 20
+	. = ..()
+
 //Exosuit-mounted kinetic accelerator
 /obj/item/mecha_parts/mecha_equipment/weapon/energy/mecha_kineticgun
 	name = "Exosuit Proto-kinetic Accelerator"