qt-dab-4.0

[JvanKatwijk]

Since the original version of 3.7 came, many changes have been applied. Latest changes were adding filters to Lime and rtlsdr handler and
adding a button on the main widget. Enough to move on to a new version number.
Note: the manual has not been updated yet.

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This discussion was created from the release qt-dab-4.0.