Fixes and adds blast cannons to traitor science uplink items (#38093)

rscadd: Blast cannons have been fixed and are now available for purchase by traitorous scientists for a low low price of 14TC.
rscadd: Blast cannons take the explosive power of a TTV bomb and ejects a linear projectile that will apply what the bomb would do to a certain tile at that distance to that tile. However, this will not cause breaches, or gib mobs, unless the gods (admins) so will it.
experimental: Blast cannons do not respect maxcap. (Unless the admins so will it.)

code/modules/uplink/uplink_items.dm

@@ -1412,6 +1412,16 @@ GLOBAL_LIST_INIT(uplink_items, subtypesof(/datum/uplink_item))
 	limited_stock = 2 //you can't use more than two!
 	restricted_roles = list("Shaft Miner")
 
+/datum/uplink_item/role_restricted/blastcannon
+	name = "Blast Cannon"
+	desc = "A highly specialized weapon, the Blast Cannon is actually relatively simple. It contains an attachment for a tank transfer valve mounted to an angled pipe specially constructed \
+			withstand extreme pressure and temperatures, and has a mechanical trigger for triggering the transfer valve. Essentially, it turns the explosive force of a bomb into a narrow-angle \
+			blast wave \"projectile\". Aspiring scientists may find this highly useful, as forcing the pressure shockwave into a narrow angle seems to be able to bypass whatever quirk of physics \
+			disallows explosive ranges above a certain distance, allowing for the device to use the theoretical yield of a transfer valve bomb, instead of the factual yield."
+	item = /obj/item/gun/blastcannon
+	cost = 14							//High cost because of the potential for extreme damage in the hands of a skilled scientist.
+	restricted_roles = list("Research Director", "Scientist")
+
 /datum/uplink_item/device_tools/clown_bomb
 	name = "Clown Bomb"
 	desc = "The Clown bomb is a hilarious device capable of massive pranks. It has an adjustable timer, \