Improves belt item overlay code, Adds new belt item overlay sprites (#17568)

* belt-improvements-and-sprites

* fixes my fix of botany belt allowed contents

code/game/objects/items/devices/flash.dm

@@ -4,6 +4,7 @@
 	icon = 'icons/obj/device.dmi'
 	icon_state = "flash"
 	item_state = "flashtool"	//looks exactly like a flash (and nothing like a flashbang)
+	belt_icon = "flash"
 	throwforce = 0
 	w_class = WEIGHT_CLASS_TINY
 	throw_speed = 3

code/game/objects/items/devices/handheld_defib.dm

@@ -6,6 +6,7 @@
 	righthand_file = 'icons/mob/inhands/items_righthand.dmi'
 	icon_state = "defib-on"
 	item_state = "defib"
+	belt_icon = "defib"
 
 	var/icon_base = "defib"
 	var/cooldown = FALSE

code/game/objects/items/devices/lightreplacer.dm

@@ -46,6 +46,7 @@
 	icon = 'icons/obj/janitor.dmi'
 	icon_state = "lightreplacer0"
 	item_state = "electronic"
+	belt_icon = "light_replacer"
 	w_class = WEIGHT_CLASS_SMALL
 	flags = CONDUCT
 	slot_flags = SLOT_BELT

code/game/objects/items/devices/scanners.dm

@@ -81,10 +81,11 @@ REAGENT SCANNER
 				to_chat(user, "<span class='notice'>Subject is not addicted to any reagents.</span>")
 
 /obj/item/healthanalyzer
-	name = "Health Analyzer"
+	name = "health analyzer"
 	icon = 'icons/obj/device.dmi'
 	icon_state = "health"
 	item_state = "healthanalyzer"
+	belt_icon = "health_analyzer"
 	desc = "A hand-held body scanner able to distinguish vital signs of the subject."
 	flags = CONDUCT | NOBLUDGEON
 	slot_flags = SLOT_BELT

code/game/objects/items/devices/traitordevices.dm

@@ -11,10 +11,11 @@
 */
 
 /obj/item/rad_laser
-	name = "Health Analyzer"
+	name = "health analyzer"
 	icon = 'icons/obj/device.dmi'
 	icon_state = "health2"
 	item_state = "healthanalyzer"
+	belt_icon = "health_analyzer"
 	desc = "A hand-held body scanner able to distinguish vital signs of the subject. A strange microlaser is hooked on to the scanning end."
 	flags = CONDUCT | NOBLUDGEON
 	slot_flags = SLOT_BELT