Add map loading logic and spawn rate control

Zennysoft.Game.Ma/addons/special_floor_layout_node/SpecialFloorLayout.cs

@@ -0,0 +1,25 @@
+using Godot;
+using Zennysoft.Game.Ma;
+
+[Tool]
+public partial class SpecialFloorLayout : LayoutType
+{
+  [Export]
+  public SpecialFloorType FloorName { get; set; }
+
+  public override void _EnterTree()
+  {
+    base._EnterTree();
+  }
+
+  public enum SpecialFloorType
+  {
+    Overworld,
+    Altar,
+    BossFloorA,
+    BossFloorB,
+    GoddessOfGuidanceFloor,
+    TrueGoddessOfGuidanceFloor,
+    FinalFloor
+  }
+}