ronso0 / mixxx / 28962201701

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DlgTrackInfoMulti: show progress dialog when writing metadata on close

This would stall the GUI, because if DlgTrackInfoMulti was the last instance holding the TrackPointers
it just manipulated, GlobalTrackCache would trigger metadata export to files (if enabled) which might
take quite some time for many/big files or just slow disk I/O.

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