Dynamic space world generation and debris. (#15120)

* World generation (squash)

* Test fixes.

* command

* o

* Access cleanup.

* Documentation touchups.

* Use a prototype serializer for BiomeSelectionComponent

* Struct enumerator in SimpleFloorPlanPopulatorSystem

* Safety margins around PoissonDiskSampler, cookie acquisition methodologies

* Struct enumerating PoissonDiskSampler; internal side

* Struct enumerating PoissonDiskSampler: Finish it

* Update WorldgenConfigSystem.cs

awa

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Co-authored-by: moonheart08 <moonheart08@users.noreply.github.com>
Co-authored-by: 20kdc <asdd2808@gmail.com>

Content.Server/Worldgen/Components/LocalityLoaderComponent.cs

@@ -0,0 +1,19 @@
+using Content.Server.Worldgen.Systems;
+
+namespace Content.Server.Worldgen.Components;
+
+/// <summary>
+///     This is used for sending a signal to the entity it's on to load contents whenever a loader gets close enough.
+///     Does not support unloading.
+/// </summary>
+[RegisterComponent]
+[Access(typeof(LocalityLoaderSystem))]
+public sealed class LocalityLoaderComponent : Component
+{
+    /// <summary>
+    ///     The maximum distance an entity can be from the loader for it to not load.
+    ///     Once a loader is closer than this, the event is fired and this component removed.
+    /// </summary>
+    [DataField("loadingDistance")] public int LoadingDistance = 32;
+}
+