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.

scripts/actors/character.gd

@@ -0,0 +1,26 @@
+## Character.gd
+# Base class for all turn-based characters (player, enemies, etc.)
+# Handles registration with TurnManager and provides a turn interface.
+class_name Character
+extends CharacterBody2D
+
+# Signal emitted when this character's turn is finished.
+signal turn_finished
+
+# Called by TurnManager to let this character take its turn.
+# Subclasses should override this to implement their own turn logic.
+func take_turn() -> void:
+	# Virtual method to be overridden by subclasses
+	pass
+
+# Called when the node enters the scene tree.
+# Registers this character with the TurnManager for turn order.
+func _ready() -> void:
+	if Engine.is_editor_hint():
+		return
+	TurnManager.register_entity(self)
+
+# Call this to remove the character from the turn system and free it from the scene.
+func die() -> void:
+	TurnManager.unregister_entity(self)
+	queue_free()