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/tools/crowbar.dm

@@ -4,6 +4,7 @@
 	icon = 'icons/obj/tools.dmi'
 	icon_state = "crowbar"
 	item_state = "crowbar"
+	belt_icon = "crowbar"
 	usesound = 'sound/items/crowbar.ogg'
 	flags = CONDUCT
 	slot_flags = SLOT_BELT
@@ -66,6 +67,7 @@
 	desc = "A set of jaws of life, the magic of science has managed to fit it down into a device small enough to fit in a tool belt. It's fitted with a prying head."
 	icon_state = "jaws_pry"
 	item_state = "jawsoflife"
+	belt_icon = "jaws"
 	materials = list(MAT_METAL=150,MAT_SILVER=50,MAT_TITANIUM=25)
 	origin_tech = "materials=2;engineering=2"
 	usesound = 'sound/items/jaws_pry.ogg'

code/game/objects/items/tools/multitool.dm

@@ -11,6 +11,7 @@
 	desc = "Used for pulsing wires to test which to cut. Not recommended by doctors."
 	icon = 'icons/obj/device.dmi'
 	icon_state = "multitool"
+	belt_icon = "multitool"
 	flags = CONDUCT
 	force = 0
 	w_class = WEIGHT_CLASS_SMALL

code/game/objects/items/tools/screwdriver.dm

@@ -4,6 +4,7 @@
 	desc = "You can be totally screwy with this."
 	icon = 'icons/obj/tools.dmi'
 	icon_state = "screwdriver_map"
+	belt_icon = "screwdriver"
 	flags = CONDUCT
 	slot_flags = SLOT_BELT
 	force = 5
@@ -74,6 +75,7 @@
 	desc = "A simple hand drill with a screwdriver bit attached."
 	icon_state = "drill_screw"
 	item_state = "drill"
+	belt_icon = "hand_drill"
 	materials = list(MAT_METAL=150,MAT_SILVER=50,MAT_TITANIUM=25)
 	origin_tech = "materials=2;engineering=2" //done for balance reasons, making them high value for research, but harder to get
 	force = 8 //might or might not be too high, subject to change

code/game/objects/items/tools/welder.dm

@@ -6,6 +6,7 @@
 	icon = 'icons/obj/tools.dmi'
 	icon_state = "welder"
 	item_state = "welder"
+	belt_icon = "welder"
 	flags = CONDUCT
 	slot_flags = SLOT_BELT
 	force = 3
@@ -192,6 +193,7 @@
 	name = "industrial welding tool"
 	desc = "A slightly larger welder with a larger tank."
 	icon_state = "indwelder"
+	belt_icon = "welder_ind"
 	maximum_fuel = 40
 	materials = list(MAT_METAL=70, MAT_GLASS=60)
 	origin_tech = "engineering=2;plasmatech=2"
@@ -227,6 +229,7 @@
 	desc = "An upgraded welder based off the industrial welder."
 	icon_state = "upindwelder"
 	item_state = "upindwelder"
+	belt_icon = "welder_upg"
 	maximum_fuel = 80
 	materials = list(MAT_METAL=70, MAT_GLASS=120)
 	origin_tech = "engineering=3;plasmatech=2"
@@ -236,6 +239,7 @@
 	desc = "An experimental welder capable of self-fuel generation and less harmful to the eyes."
 	icon_state = "exwelder"
 	item_state = "exwelder"
+	belt_icon = "welder_exp"
 	maximum_fuel = 40
 	materials = list(MAT_METAL=70, MAT_GLASS=120)
 	origin_tech = "materials=4;engineering=4;bluespace=3;plasmatech=4"

code/game/objects/items/tools/wirecutters.dm

@@ -3,6 +3,7 @@
 	desc = "This cuts wires."
 	icon = 'icons/obj/tools.dmi'
 	icon_state = "cutters"
+	belt_icon = "wirecutters"
 	flags = CONDUCT
 	slot_flags = SLOT_BELT
 	force = 6
@@ -82,6 +83,7 @@
 	desc = "A set of jaws of life, the magic of science has managed to fit it down into a device small enough to fit in a tool belt. It's fitted with a cutting head."
 	icon_state = "jaws_cutter"
 	item_state = "jawsoflife"
+	belt_icon = "jaws"
 	origin_tech = "materials=2;engineering=2"
 	materials = list(MAT_METAL=150,MAT_SILVER=50,MAT_TITANIUM=25)
 	usesound = 'sound/items/jaws_cut.ogg'

code/game/objects/items/tools/wrench.dm

@@ -4,6 +4,7 @@
 	desc = "A wrench with common uses. Can be found in your hand."
 	icon = 'icons/obj/tools.dmi'
 	icon_state = "wrench"
+	belt_icon = "wrench"
 	flags = CONDUCT
 	slot_flags = SLOT_BELT
 	force = 5
@@ -50,6 +51,7 @@
 	desc = "A simple powered drill with a bolt bit."
 	icon_state = "drill_bolt"
 	item_state = "drill"
+	belt_icon = "hand_drill"
 	usesound = 'sound/items/drill_use.ogg'
 	materials = list(MAT_METAL=150,MAT_SILVER=50,MAT_TITANIUM=25)
 	origin_tech = "materials=2;engineering=2" //done for balance reasons, making them high value for research, but harder to get