gd,refacto: added state chart addon and namespace cleanup

addons/godot_state_charts/debug_util.gd

@@ -0,0 +1,8 @@
+## Returns the path of a node in the scene tree
+## Returns the name of the node if the node is not in the tree.
+static func path_of(node: Node) -> String:
+	if node == null:
+		return ""
+	if !node.is_inside_tree():
+		return node.name + " (not in tree)"
+	return str(node.get_path())