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/PostGeneration/MiddleConnectionDunGen.cs

@@ -0,0 +1,19 @@
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Places the specified entities on the middle connections between rooms
+/// </summary>
+public sealed partial class MiddleConnectionDunGen : IDunGenLayer
+{
+    /// <summary>
+    /// How much overlap there needs to be between 2 rooms exactly.
+    /// </summary>
+    [DataField]
+    public int OverlapCount = -1;
+
+    /// <summary>
+    /// How many connections to spawn between rooms.
+    /// </summary>
+    [DataField]
+    public int Count = 1;
+}