Dungeon generation refactor (#17121)

Content.Shared/Procedural/PostGeneration/RoomEntrancePostGen.cs

@@ -0,0 +1,22 @@
+using Content.Shared.Maps;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.List;
+
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Places tiles / entities onto room entrances.
+/// </summary>
+public sealed class RoomEntrancePostGen : IPostDunGen
+{
+    [DataField("entities", customTypeSerializer: typeof(PrototypeIdListSerializer<EntityPrototype>))]
+    public List<string?> Entities = new()
+    {
+        "CableApcExtension",
+        "AirlockGlass",
+    };
+
+    [DataField("tile", customTypeSerializer:typeof(PrototypeIdSerializer<ContentTileDefinition>))]
+    public string Tile = "FloorSteel";
+}