Use MediaPlayer instead of MediaElement if available for PlaySoundAction?

[hawkerm]

On newer Windows versions (1607) it's recommended to not use MediaElement as it's no longer getting updates. Instead MediaPlayer can make it simple to use without needing to worry about XAML/Visual Tree. This could drop the PopUp usage.

Not sure if the min version wants to be bumped, but maybe capability could be detected and used to switch the code used?

References:

• https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/play-audio-and-video-with-mediaplayer#play-a-media-file-with-mediaplayer
• https://docs.microsoft.com/en-us/uwp/api/Windows.UI.Xaml.Controls.MediaElement?view=winrt-19041#remarks