3/4 tile decal overlays (#7335)

Resources/Textures/Decals/Overlays/greyscale.rsi/meta.json

@@ -34,6 +34,18 @@
     {
       "name": "quartertile_overlay_270"
     },
+    {
+      "name": "threequartertile_overlay"
+    },
+    {
+      "name": "threequartertile_overlay_90"
+    },
+    {
+      "name": "threequartertile_overlay_180"
+    },
+    {
+      "name": "threequartertile_overlay_270"
+    },
     {
       "name": "checkerNESW"
     },