remove unused vars with invalid types

code/global.dm

@@ -488,11 +488,6 @@ var/global
 	centralConn = 1 //Are we able to connect to the central server?
 	centralConnTries = 0 //How many times have we tried and failed to connect?
 
-	/* nuclear reactor & parameter set, if it exists */
-	obj/machinery/power/nuke/fchamber/nuke_core = null
-	obj/machinery/power/nuke/nuke_turbine/nturbine = null
-	datum/nuke_knobset/nuke_knobs = null
-
 	//Resource Management
 	list/localResources = list()
 	list/cachedResources = list()

code/modules/networks/computer3/computer3.dm

@@ -13,7 +13,6 @@
 	var/obj/item/disk/data/fixed_disk/hd = null
 	var/datum/computer/file/terminal_program/active_program
 	var/datum/computer/file/terminal_program/host_program //active is set to this when the normal active quits, if available
-	var/datum/computer/file/terminal_shell/os_shell
 	var/list/processing_programs = list()
 	var/obj/item/disk/data/floppy/diskette = null
 	var/list/peripherals = list()

code/obj/item/device/infrared_stuff.dm

@@ -15,7 +15,6 @@ TYPEINFO(/obj/item/device/infra)
 	name = "Laser Tripwire"
 	desc = "Emits a visible or invisible beam and is triggered when the beam is interrupted."
 	icon_state = "infrared0"
-	var/obj/beam/i_beam/first = null
 	var/state = 0
 	var/visible = 0
 	flags = FPRINT | TABLEPASS| CONDUCT

code/obj/item/storage/secure_safe.dm

@@ -5,8 +5,6 @@
 ABSTRACT_TYPE(/obj/item/storage/secure)
 /obj/item/storage/secure
 	name = "storage/secure"
-	var/atom/movable/screen/storage/boxes = null
-	var/atom/movable/screen/close/closer = null
 	var/icon_locking = "secureb"
 	var/icon_sparking = "securespark"
 	var/icon_open = "secure0"

code/world.dm

@@ -115,8 +115,6 @@ var/global/mob/twitch_mob = 0
 		create_turf_html = grabResource("html/admin/create_object.html")
 		create_turf_html = replacetext(create_turf_html, "null /* object types */", "\"[turfjs]\"")
 
-var/f_color_selector_handler/F_Color_Selector
-
 /proc/buildMaterialPropertyCache()
 	if(materialProps.len) return
 	for(var/A in childrentypesof(/datum/material_property)) //Caching material props