Welder sprite update (#12747)

* New welder sprites for welders using duplicate sprites.  Credit to DragonBro for the sprites.

* The GATLING WELDER

* removes capitalization

* I don't know how this works but Kurfurst is smarter than me I do know that.

* Comment thanks to Comics explanation.

* Dropping redundant proc calls.

* Cutting the comment down to only note that it is a ternary operator.

* Adds in_hand sprites for welders.

* replaces items_lefthand.dmi and righthand with their previous files.  Adds all welder in hand sprites to misc_tools.dmi

Adds research to unlock gatling welders.

* Finalization of research requirements.

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

@@ -204,8 +204,10 @@
  */
 /obj/item/weapon/weldingtool
 	name = "welding tool"
+	desc = "Ensure the switch is safely in the off position before refueling."
 	icon = 'icons/obj/items.dmi'
 	icon_state = "welder"
+	inhand_states = list("left_hand" = 'icons/mob/in-hand/left/misc_tools.dmi', "right_hand" = 'icons/mob/in-hand/right/misc_tools.dmi')
 	hitsound = 'sound/weapons/toolhit.ogg'
 	flags = FPRINT
 	siemens_coefficient = 1
@@ -293,7 +295,7 @@
 			if(src.icon_state != "welder") //Check that the sprite is correct, if it isnt, it means toggle() was not called
 				src.force = 3
 				src.damtype = "brute"
-				src.icon_state = "welder"
+				update_icon()
 				src.hitsound = "sound/weapons/toolhit.ogg"
 				src.welding = 0
 			processing_objects.Remove(src)
@@ -303,7 +305,7 @@
 			if(src.icon_state != "welder1") //Check that the sprite is correct, if it isnt, it means toggle() was not called
 				src.force = 15
 				src.damtype = "fire"
-				src.icon_state = "welder1"
+				update_icon()
 				src.hitsound = "sound/weapons/welderattack.ogg"
 			if(prob(5))
 				remove_fuel(1)
@@ -399,7 +401,7 @@
 			to_chat(usr, "<span class='notice'>\The [src] switches on.</span>")
 			src.force = 15
 			src.damtype = "fire"
-			src.icon_state = "welder1"
+			update_icon()
 			processing_objects.Add(src)
 		else
 			to_chat(usr, "<span class='notice'>Need more fuel!</span>")
@@ -410,7 +412,7 @@
 		to_chat(usr, "<span class='notice'>\The [src] switches off.</span>")
 		src.force = 3
 		src.damtype = "brute"
-		src.icon_state = "welder"
+		update_icon()
 		src.welding = 0
 
 //Turns off the welder if there is no more fuel (does this really need to be its own proc?)
@@ -431,7 +433,7 @@
 			to_chat(usr, "<span class='notice'>You switch the [src] on.</span>")
 			src.force = 15
 			src.damtype = "fire"
-			src.icon_state = "welder1"
+			update_icon()
 			processing_objects.Add(src)
 		else
 			to_chat(usr, "<span class='notice'>Need more fuel!</span>")
@@ -444,7 +446,7 @@
 			to_chat(usr, "<span class='notice'>\The [src] shuts off!</span>")
 		src.force = 3
 		src.damtype = "brute"
-		src.icon_state = "welder"
+		update_icon()
 		src.welding = 0
 
 //Decides whether or not to damage a player's eyes based on what they're wearing as protection
@@ -497,11 +499,18 @@
 				spawn(100)
 					user.disabilities &= ~NEARSIGHTED
 
+/obj/item/weapon/weldingtool/update_icon()
+	..()
+	icon_state = "[initial(icon_state)][welding ? "1" : ""]" //Ternary operator.
+
+
 /obj/item/weapon/weldingtool/empty
 	start_fueled = 0
 
 /obj/item/weapon/weldingtool/largetank
 	name = "Industrial Welding Tool"
+	desc = "The cutting edge between portability and tank size."
+	icon_state = "welder_large"
 	max_fuel = 40
 	starting_materials = list(MAT_IRON = 70, MAT_GLASS = 60)
 	origin_tech = Tc_ENGINEERING + "=2"
@@ -511,6 +520,8 @@
 
 /obj/item/weapon/weldingtool/hugetank
 	name = "Upgraded Welding Tool"
+	desc = "A large tank for a large job."
+	icon_state = "welder_larger"
 	max_fuel = 80
 	w_class = W_CLASS_MEDIUM
 	starting_materials = list(MAT_IRON = 70, MAT_GLASS = 120)
@@ -519,6 +530,19 @@
 /obj/item/weapon/weldingtool/hugetank/empty
 	start_fueled = 0
 
+/obj/item/weapon/weldingtool/gatling
+	name = "gatling welder"
+	desc = "Engineering Dakka."
+	icon_state = "welder_gatling"
+	max_fuel = 160
+	w_class = W_CLASS_HUGE
+	starting_materials = list(MAT_IRON = 18750, MAT_GLASS = 18750)
+	origin_tech = Tc_ENGINEERING + "=4"
+
+/obj/item/weapon/weldingtool/gatling/empty
+	start_fueled = 0
+
+
 /obj/item/weapon/weldingtool/experimental
 	name = "Experimental Welding Tool"
 	max_fuel = 40

code/modules/research/designs/engineering.dm

@@ -162,3 +162,13 @@
 	materials = list(MAT_IRON = 500, MAT_GLASS = 100)
 	build_path = /obj/item/device/t_scanner/advanced
 	category = "Engineering"
+
+/datum/design/welder_gatling
+	name = "Gatling Welder"
+	desc = "Engineering Dakka."
+	id = "welder_gatling"
+	req_tech = list(Tc_ENGINEERING = 5, Tc_BLUESPACE = 2)
+	build_type = PROTOLATHE
+	materials = list(MAT_IRON = 18750, MAT_GLASS = 9375)
+	build_path = /obj/item/weapon/weldingtool/gatling/empty
+	category = "Engineering"