Ports the /tg/ shotgun sprites (#22539)

* ports the /tg/ shotgun sprites

* webedit fail

* i'm wario and my furniture is broken

* hopefully finally actually fix tests? maybe? my couch is broken

* update shotgun cabinet

* update shotgun cabinet MORE

* ohhhhhh my god...

Resources/Textures/Objects/Weapons/Guns/Shotguns/improvised_shotgun.rsi/meta.json

@@ -1,7 +1,7 @@
 {
   "version": 1,
   "license": "CC-BY-SA-3.0",
-  "copyright": "Taken/modified from https://github.com/tgstation/tgstation/ at commit fb2d71495bfe81446159ef528534193d09dd8d34, inhand and back sprites modified by Flareguy",
+  "copyright": "Taken from https://github.com/tgstation/tgstation/ at commit fb2d71495bfe81446159ef528534193d09dd8d34, back sprite modified by Flareguy",
   "size": {
     "x": 32,
     "y": 32
@@ -10,14 +10,6 @@
     {
       "name": "icon"
     },
-	{
-      "name": "inhand-left",
-      "directions": 4
-	},
-	{
-	  "name": "inhand-right",
-	  "directions": 4
-	},
     {
       "name": "equipped-BACKPACK",
       "directions": 4