VGRoid support (#27659)

* Dungeon spawn support for grid spawns

* Recursive dungeons working

* Mask approach working

* zack

* More work

* Fix recursive dungeons

* Heap of work

* weh

* the cud

* rar

* Job

* weh

* weh

* weh

* Master merges

* orch

* weh

* vgroid most of the work

* Tweaks

* Tweaks

* weh

* do do do do do do

* Basic layout

* Ore spawning working

* Big breaking changes

* Mob gen working

* weh

* Finalising

* emo

* More finalising

* reverty

* Reduce distance

Content.Shared/Procedural/DungeonLayers/OreDunGen.cs

@@ -0,0 +1,42 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Procedural.DungeonLayers;
+
+/// <summary>
+/// Generates veins inside of the specified dungeon.
+/// </summary>
+/// <remarks>
+/// Generates on top of existing entities for sanity reasons moreso than performance.
+/// </remarks>
+public sealed partial class OreDunGen : IDunGenLayer
+{
+    /// <summary>
+    /// If the vein generation should occur on top of existing entities what are we replacing.
+    /// </summary>
+    [DataField]
+    public EntProtoId? Replacement;
+
+    /// <summary>
+    /// Entity to spawn.
+    /// </summary>
+    [DataField(required: true)]
+    public EntProtoId Entity;
+
+    /// <summary>
+    /// Maximum amount of group spawns
+    /// </summary>
+    [DataField]
+    public int Count = 10;
+
+    /// <summary>
+    /// Minimum entities to spawn in one group.
+    /// </summary>
+    [DataField]
+    public int MinGroupSize = 1;
+
+    /// <summary>
+    /// Maximum entities to spawn in one group.
+    /// </summary>
+    [DataField]
+    public int MaxGroupSize = 1;
+}