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Port to standard Kirigami icon sizes to automatically fix the size being
incorrect with a high DPI scale factor.

By porting to Kirigami.Separator and defining a new property (`hairline`)
which rounds down the device pixel ratio to an integer, we can improve
the look of single-pixel lines for people using fractional scale factors.

done with Kirigami.ListSectionHeader

Summary:
only possible for all albums, all artists and all genres

related to T11154

Test Plan:
after adding
[Views]
EmbeddedView=3

Genres are added to ViewSelector list

properly display icons in views list including albums (default icon and cover)

introduce ViewsListData to handle data of the list of views

to be used by both the model and the ViewManager class handling the
switch between views

if config changed, embedded category property may have changed

separate ViewsListData object from ViewsModel and use it

will allow sharing with the ViewsManager object

ViewsModel no longer have any properties

(cherry picked from commit 11d76f78)

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

in fact we already require a version KDE Frameworks 5 that depends on Qt
5.12