Major update of all demo programs to use new PEP8 bindings, etc

DemoPrograms old/Demo_Design_Pattern_Persistent_Window.py

@@ -0,0 +1,24 @@
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+
+layout =    [
+            [sg.Text('Your typed chars appear here:'), sg.Text('', size=(20,1), key='-OUTPUT-')],
+            [sg.Input(do_not_clear=True, key='-IN-')],
+            [sg.Button('Show'), sg.Button('Exit')]
+            ]
+
+window = sg.Window('Window Title').Layout(layout)
+
+while True:  # Event Loop
+    event, values = window.Read()
+    print(event, values)
+    if event is None or event == 'Exit':
+        break
+    if event == 'Show':
+        # change the "output" element to be the value of "input" element  
+        window.FindElement('-OUTPUT-').Update(values['-IN-'])
+
+window.Close()