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.Shared/CCVar/CCVars.cs

@@ -1589,5 +1589,26 @@ namespace Content.Shared.CCVar
         /// </summary>
         public static readonly CVarDef<bool> ConfigPresetDebug =
             CVarDef.Create("config.preset_debug", true, CVar.SERVERONLY);
+
+        /*
+         * World Generation
+         */
+        /// <summary>
+        ///     Whether or not world generation is enabled.
+        /// </summary>
+        public static readonly CVarDef<bool> WorldgenEnabled =
+            CVarDef.Create("worldgen.enabled", false, CVar.SERVERONLY);
+
+        /// <summary>
+        ///     The worldgen config to use.
+        /// </summary>
+        public static readonly CVarDef<string> WorldgenConfig =
+            CVarDef.Create("worldgen.worldgen_config", "Default", CVar.SERVERONLY);
+
+        /// <summary>
+        ///     The maximum amount of time the entity GC can process, in ms.
+        /// </summary>
+        public static readonly CVarDef<int> GCMaximumTimeMs =
+            CVarDef.Create("entgc.maximum_time_ms", 5, CVar.SERVERONLY);
     }
 }