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/Structures/Wallmounts/shotgun_cabinet.rsi/meta.json

@@ -1,7 +1,7 @@
 {
   "version": 1,
   "license": "CC-BY-SA-3.0",
-  "copyright": "Inspired by tg station\u0027s fireaxe cabinet https://github.com/tgstation/tgstation/commit/d0d81185f09ca30d3b0856d476544240dba0de53 Made by DISCORD@ps3moira#9488",
+  "copyright": "Inspired by tg station\u0027s fireaxe cabinet https://github.com/tgstation/tgstation/commit/d0d81185f09ca30d3b0856d476544240dba0de53 Made by DISCORD@ps3moira#9488, sprite further modified and updated by Flareguy",
   "size": {
     "x": 32,
     "y": 32