Opens splash window for Python3 Tkinter, with progressbar.
Please see the gif animation below.
- stackoverflow "How to make a Tkinter window jump to the front?"
https://stackoverflow.com/questions/1892339/how-to-make-a-tkinter-window-jump-to-the-front
- Getting Your Screen Resolution with Python
https://www.blog.pythonlibrary.org/2015/08/18/getting-your-screen-resolution-with-python/
- stackoverflow "How to create downloading progress bar in ttk?"
https://stackoverflow.com/questions/7310511/how-to-create-downloading-progress-bar-in-ttk