Adds Checkerboard Tiles, External Hull Plating, Hardened Reinforced Floors, & Monotile Dirty Decal (#18676)

* adds checkered floor tiles, hull tiles, and steel monotile decal

* adds checker floors, hull floors, and dirty steel monotile decal

* adds hardened reinf tiles

Resources/Textures/Objects/Tiles/tile.rsi/meta.json

@@ -13,6 +13,12 @@
     {
       "name": "dirty"
     },
+    {
+      "name": "checker-light"
+    },
+    {
+      "name": "checker-dark"
+    },
     {
       "name": "gcircuit"
     },