feat: Add core map generation and management system

- Introduced MapData, MapGenerator, and MapPainter classes for procedural map generation.
- Implemented LevelManager to handle level initialization and navigation.
- Created TurnManager for managing turn order in a turn-based system.
- Added Player and Enemy character classes with movement and turn-taking capabilities.
- Established pathfinding using AStar2D in PathfindingHandler.
- Integrated new scenes for player and enemy characters, along with world setup.
- Included a new tileset for futuristic Zelda-themed assets.

map/room.gd

@@ -0,0 +1,10 @@
+## Room.gd
+# Resource representing a single room in the map.
+# Stores the room's position and size in grid coordinates.
+class_name Room
+extends Resource
+
+# Top-left position of the room in grid coordinates.
+var room_pos: Vector2i
+# Size of the room (width, height) in tiles.
+var room_size: Vector2i