Gun refactor (#8301)

Co-authored-by: Kara <lunarautomaton6@gmail.com>
Co-authored-by: T-Stalker <le0nel_1van@hotmail.com>
Co-authored-by: T-Stalker <43253663+DogZeroX@users.noreply.github.com>
Co-authored-by: ElectroJr <leonsfriedrich@gmail.com>
Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Resources/Textures/Objects/Weapons/Guns/Ammunition/Boxes/rifle.rsi/meta.json

@@ -0,0 +1,38 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from cev-eris at https://github.com/discordia-space/CEV-Eris/raw/89456d18dd3e7c330839121e3c6bc8c609700137/icons/obj/ammo.dmi",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "base"
+    },
+    {
+      "name": "base-b"
+    },
+    {
+      "name": "mag-1"
+    },
+    {
+      "name": "magb-1"
+    },
+    {
+      "name": "flash"
+    },
+    {
+      "name": "hv"
+    },
+    {
+      "name": "practice"
+    },
+    {
+      "name": "practice-b"
+    },
+    {
+      "name": "rubber"
+    }
+  ]
+}