Ice anomaly spawns ice underneath it (#21227)

* added TileAnomalySystem to AnomalyIce

* added FloorIce for station

* created ice crust entity to spawn under ice anomaly

* update draw depth for ice crust

* uh oh, added ice-sliding but at what cost

* resolved mispredicts

* updated sprite alpha, removed appearance component (not used)

* fixed function not reflecting event name, left datafield attributes blank, added one comment about saving data (?)

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Co-authored-by: Yurii Kis <yurii.kis@smartteksas.com>

Resources/Textures/Objects/Misc/ice_crust.rsi/meta.json

@@ -0,0 +1,14 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from space-station-14+Resources+Textures+Tiles+Planet+Snow",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "ice"
+    }
+  ]
+}