refactored cell world building

#8 included resources into cell data

scripts/building_manager.gd

@@ -0,0 +1,12 @@
+extends Node2D
+
+@onready var world: World = $".."
+var base = preload("res://scene/base.tscn")
+
+func _unhandled_input(event):
+	if event is InputEventMouseButton and event.is_pressed() and event.button_index == MOUSE_BUTTON_LEFT:
+		var build = base.instantiate()
+		build.position = get_global_mouse_position()
+		build.world = world
+		add_child(build)
+		#world_grid.set_cell(2, world_grid.local_to_map(get_global_mouse_position()), 0, Vector2i(16,2))