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 (?)

---------

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

Content.Shared/Movement/Components/FrictionContactsComponent.cs

@@ -0,0 +1,31 @@
+using Content.Shared.Movement.Systems;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Movement.Components;
+
+[NetworkedComponent, RegisterComponent]
+[AutoGenerateComponentState]
+[Access(typeof(FrictionContactsSystem))]
+public sealed partial class FrictionContactsComponent : Component
+{
+    /// <summary>
+    /// Modified mob friction while on FrictionContactsComponent
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    [AutoNetworkedField]
+    public float MobFriction = 0.5f;
+
+    /// <summary>
+    /// Modified mob friction without input while on FrictionContactsComponent
+    /// </summary>
+    [AutoNetworkedField]
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float MobFrictionNoInput = 0.05f;
+
+    /// <summary>
+    /// Modified mob acceleration while on FrictionContactsComponent
+    /// </summary>
+    [AutoNetworkedField]
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float MobAcceleration = 2.0f;
+}