Renamed demo files, new demo of tabbed forms

Changed filenames to remove spaces so will be easier to work with on Linux.

Demo_Media_Player.py

@@ -0,0 +1,64 @@
+import PySimpleGUI as sg
+
+#
+# An Async Demonstration of a media player
+# Uses button images for a super snazzy look
+# See how it looks here:
+# https://user-images.githubusercontent.com/13696193/43159403-45c9726e-8f50-11e8-9da0-0d272e20c579.jpg
+#
+def MediaPlayerGUI():
+
+    # Images are located in a subfolder in the Demo Media Player.py folder
+    image_pause = './ButtonGraphics/Pause.png'
+    image_restart = './ButtonGraphics/Restart.png'
+    image_next = './ButtonGraphics/Next.png'
+    image_exit = './ButtonGraphics/Exit.png'
+
+    # A text element that will be changed to display messages in the GUI
+    TextElem = sg.Text('', size=(15, 2), font=("Helvetica", 14))
+
+    # Open a form, note that context manager can't be used generally speaking for async forms
+    form = sg.FlexForm('Media File Player', auto_size_text=True, default_element_size=(20, 1),
+                       font=("Helvetica", 25))
+    # define layout of the rows
+    layout= [[sg.Text('Media File Player',size=(17,1), font=("Helvetica", 25))],
+            [TextElem],
+             [sg.ReadFormButton('Restart Song', button_color=sg.TRANSPARENT_BUTTON,
+                                image_filename=image_restart, image_size=(50, 50), image_subsample=2, border_width=0),
+                                sg.Text(' ' * 2),
+              sg.ReadFormButton('Pause', button_color=sg.TRANSPARENT_BUTTON,
+                                image_filename=image_pause, image_size=(50, 50), image_subsample=2, border_width=0),
+                                sg.Text(' ' * 2),
+              sg.ReadFormButton('Next', button_color=sg.TRANSPARENT_BUTTON,
+                                image_filename=image_next, image_size=(50, 50), image_subsample=2, border_width=0),
+                                sg.Text(' ' * 2),
+              sg.Text(' ' * 2), sg.SimpleButton('Exit', button_color=sg.TRANSPARENT_BUTTON,
+                                                image_filename=image_exit, image_size=(50, 50), image_subsample=2, border_width=0)],
+             [sg.Text('_'*30)],
+             [sg.Text(' '*30)],
+            [
+             sg.Slider(range=(-10, 10), default_value=0, size=(10, 20), orientation='vertical', font=("Helvetica", 15)),
+             sg.Text(' ' * 2),
+             sg.Slider(range=(-10, 10), default_value=0, size=(10, 20), orientation='vertical', font=("Helvetica", 15)),
+             sg.Text(' ' * 8),
+             sg.Slider(range=(-10, 10), default_value=0, size=(10, 20), orientation='vertical', font=("Helvetica", 15))],
+             [sg.Text('Bass', font=("Helvetica", 15), size=(6, 1)),
+             sg.Text('Treble', font=("Helvetica", 15), size=(10, 1)),
+             sg.Text('Volume', font=("Helvetica", 15), size=(7, 1))]
+
+             ]
+
+    # Call the same LayoutAndRead but indicate the form is non-blocking
+    form.LayoutAndRead(layout, non_blocking=True)
+    # Our event loop
+    while(True):
+        # Read the form (this call will not block)
+        button, values = form.ReadNonBlocking()
+        if button == 'Exit':
+            break
+        # If a button was pressed, display it on the GUI by updating the text element
+        if button:
+            TextElem.Update(button)
+
+MediaPlayerGUI()
+