BayMerge Bugfix; Fixing guns, update computers. (#1263)

Fixes all the snowflake guns unique to our codebase with multiple firemodes so that they now actually behave correctly. Fixes a few bugs relating to computers, and updates modular_computers to use holoscreens.

code/modules/virus2/curer.dm

@@ -1,7 +1,7 @@
 /obj/machinery/computer/curer
 	name = "cure research machine"
 	icon = 'icons/obj/computer.dmi'
-	icon_keyboard = "med_key"
+
 	icon_screen = "dna"
 	circuit = /obj/item/weapon/circuitboard/curefab
 	var/curing

code/modules/virus2/diseasesplicer.dm

@@ -1,7 +1,7 @@
 /obj/machinery/computer/diseasesplicer
 	name = "disease splicer"
 	icon = 'icons/obj/computer.dmi'
-	icon_keyboard = "med_key"
+
 	icon_screen = "crew"
 
 	var/datum/disease2/effectholder/memorybank = null