Add "New Version Available Dialog" on PreLoadScreen

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A database table will be set up on Aimo Koivunen (MN-API) that will list the most recent version number available for each Operating System. A call to CheckVersionNumber() routine can be made in screens.py 297 and logic can determine to present a dialog notifying the user there is a new version available and ask if they want to download it now or later.

If they click "Now" you can open the browser to https://meile.app and the user can begin the download. If they check "Later" the dialog will close and they are free to continue to use the application.

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The API call is yet to be determined