Show data source during view

When viewing a opened recording file, show filename (or full path if room).
In fact, while viewing live device, show device name (s/n) [I might have more than one?]

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With 0.5.0, the bottom right corner contains a source indicator. The window title also changes to match file name or device serial number. I’m going to mark this as solved, but please reply if you have more feedback or suggestions!