Per-map parallax support (#9786)

* Per-map parallax support

* Comments for future sloth

* c

* bet

* Fix exception

* VV support

* Fix parallax

* mem

* weightless sounds

* Gravity stuff

* placeholder coz im too lazy to stash don't @ me son

* decent clouds

* sky

* Fast parallax

* Imagine spelling

* Loicense

* perish

* Fix weightless status

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Client/Parallax/Data/ParallaxLayerConfig.cs

@@ -62,5 +62,12 @@ public sealed class ParallaxLayerConfig
     /// </summary>
     [DataField("slowness")]
     public float Slowness { get; set; } = 0.5f;
+
+    /// <summary>
+    /// Should the parallax scroll at a specific rate per second.
+    /// </summary>
+    [DataField("scrolling")] public Vector2 Scrolling = Vector2.Zero;
+
+    [DataField("shader")] public string? Shader = "unshaded";
 }