refactored cell world building

#8 included resources into cell data

scripts/cell_data.gd

@@ -0,0 +1,16 @@
+class_name CellData
+extends Node
+
+@export var layer_info: Dictionary = {
+	Constants.TilemapLayers.CORRUPTION: false
+}
+var _pos: Vector2i
+
+func _init(pos: Vector2i) -> void:
+	_pos = pos
+
+func change_layer(layer: int, data: Variant) -> void:
+	layer_info[layer] = data
+
+func is_corrupted() -> bool:
+	return layer_info[Constants.TilemapLayers.CORRUPTION]