Library scan: log summary and show popup

[ronso0]

This emphasizes the logged scan summary and allows to show a respective popup, both for automatic scan at startup and manual scan.

For me, this is a step towards being able to manually find successors for moved missing tracks, may also be helpful for the New Tracks filter/feature.

info [LibraryScanner 1] ----------------------------------------------
info [LibraryScanner 1] Library scan finished after 963 ms
info [LibraryScanner 1]  1235 unchanged directories
info [LibraryScanner 1]  197 changed/added directories
info [LibraryScanner 1]  0 tracks verified from changed/added directories
info [LibraryScanner 1]  0 new tracks
info [LibraryScanner 1]  0 moved tracks
info [LibraryScanner 1]  0 missing tracks
info [LibraryScanner 1] ----------------------------------------------

if nothing changed it displays only duration and ""No changes were detected."

TODO
Find an alternative for int LibraryScanner::cleanUpScan() to get the number of relocated tracks. ✔️

[ronso0]

Find an alternative for int LibraryScanner::cleanUpScan() to get the number of relocated tracks.

Simply storing that in an LibraryScanner int member seems fine to me (reset when scan is started, no need to bother scannerGlobal with this).
Wdyt?

[JoergAtGithub]

show a respective popup, both for automatic scan at startup and manual scan

It's a nice addition to get a feedback, when I triggered the scan amnually. But I would no like to get this pop-up, when I start Mixxx.

[ronso0]

Funny thing is, I moved the connection to CoreServices so we can always get the popup.

Why do you consider the info popup disturbing / not helpful for the autorun scan during startup?