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

---------

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

Content.Server/Worldgen/Components/Debris/SimpleFloorPlanPopulatorComponent.cs

@@ -0,0 +1,47 @@
+using System.Linq;
+using Content.Server.Worldgen.Systems.Debris;
+using Content.Server.Worldgen.Tools;
+using Content.Shared.Maps;
+using Content.Shared.Storage;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.Dictionary;
+
+namespace Content.Server.Worldgen.Components.Debris;
+
+/// <summary>
+///     This is used for populating a grid with random entities automatically.
+/// </summary>
+[RegisterComponent]
+[Access(typeof(SimpleFloorPlanPopulatorSystem))]
+public sealed class SimpleFloorPlanPopulatorComponent : Component
+{
+    private Dictionary<string, EntitySpawnCollectionCache>? _caches;
+
+    /// <summary>
+    ///     The prototype facing floor plan populator entries.
+    /// </summary>
+    [DataField("entries", required: true,
+        customTypeSerializer: typeof(PrototypeIdDictionarySerializer<List<EntitySpawnEntry>, ContentTileDefinition>))]
+    private Dictionary<string, List<EntitySpawnEntry>> _entries = default!;
+
+    /// <summary>
+    ///     The spawn collections used to place entities on different tile types.
+    /// </summary>
+    [ViewVariables]
+    public Dictionary<string, EntitySpawnCollectionCache> Caches
+    {
+        get
+        {
+            if (_caches is null)
+            {
+                _caches = _entries
+                    .Select(x =>
+                        new KeyValuePair<string, EntitySpawnCollectionCache>(x.Key,
+                            new EntitySpawnCollectionCache(x.Value)))
+                    .ToDictionary(x => x.Key, x => x.Value);
+            }
+
+            return _caches;
+        }
+    }
+}
+