DungeonData rework (#37172)

* DungeonData rework

Back to fields, serializes better, just make new layers dumby.

* wawawewa

* Fix this

* Fixes

* review

* thanks fork

* fix

Content.Shared/Procedural/DungeonLayers/FillGridDunGen.cs

@@ -0,0 +1,23 @@
+using Content.Shared.Maps;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Procedural.DungeonLayers;
+
+/// <summary>
+/// Fills unreserved tiles with the specified entity prototype.
+/// </summary>
+/// <remarks>
+/// DungeonData keys are:
+/// - Fill
+/// </remarks>
+public sealed partial class FillGridDunGen : IDunGenLayer
+{
+    /// <summary>
+    /// Tiles the fill can occur on.
+    /// </summary>
+    [DataField]
+    public HashSet<ProtoId<ContentTileDefinition>>? AllowedTiles;
+
+    [DataField(required: true)]
+    public EntProtoId Entity;
+}

Content.Shared/Procedural/DungeonLayers/MobsDunGen.cs

@@ -1,4 +1,6 @@
+using Content.Shared.EntityTable;
 using Content.Shared.Storage;
+using Robust.Shared.Prototypes;
 
 namespace Content.Shared.Procedural.DungeonLayers;
 
@@ -17,5 +19,5 @@ public sealed partial class MobsDunGen : IDunGenLayer
     public int MaxCount = 1;
 
     [DataField(required: true)]
-    public List<EntitySpawnEntry> Groups = new();
+    public ProtoId<EntityTablePrototype> Contents;
 }