Added a dynamic layout system where UI elements can be moved about on a tiled grid.

scripts/layout_store.gd

@@ -0,0 +1,35 @@
+extends RefCounted
+
+static func read_json(path: String) -> Variant:
+	var file := FileAccess.open(path, FileAccess.READ)
+	if file == null or file.get_length() > 1048576:
+		return null
+	var parser := JSON.new()
+	if parser.parse(file.get_as_text()) != OK:
+		return null
+	return parser.data
+
+static func write_json(path: String, document: Dictionary) -> Error:
+	var absolute := ProjectSettings.globalize_path(path)
+	var error := DirAccess.make_dir_recursive_absolute(absolute.get_base_dir())
+	if error != OK:
+		return error
+	var temporary := absolute + ".tmp"
+	var file := FileAccess.open(temporary, FileAccess.WRITE)
+	if file == null:
+		return FileAccess.get_open_error()
+	file.store_string(JSON.stringify(document, "\t") + "\n")
+	file.flush()
+	error = file.get_error()
+	file.close()
+	if error != OK:
+		return error
+	return DirAccess.rename_absolute(temporary, absolute)
+
+static func integer_array(value: Variant, length: int) -> bool:
+	if not value is Array or value.size() != length:
+		return false
+	for number in value:
+		if not (number is int or number is float) or not is_finite(float(number)) or float(number) != floorf(float(number)):
+			return false
+	return true