Add edit method to SFG and Schedule plus typing

b_asic/GUI/__init__.py

@@ -2,6 +2,6 @@
 
 Graphical user interface for B-ASIC.
 """
-from b_asic.GUI.main_window import MainWindow, start_gui
+from b_asic.GUI.main_window import MainWindow, start_editor
 
-__all__ = ['MainWindow', 'start_gui']
+__all__ = ['MainWindow', 'start_editor']