Adjusted C++ code to handle with new and renamed objects, as well as
properties with different types.
As a result of changing types, the QML side had to be updated as well.
I hope I found everything by manually testing.
Additionally, the Qt Quick application has been updated to test the
remote sessions more easily and to make it launch again.
I've dropped the whole `<constant> * Theme.pixelRatio`-approach[^1]
for determining when the UI should split into two columns, because
the values seemed quite arbitrary and I was entering random numbers.
I'm now doing it on multiples of `Theme.itemSizeHuge`, which is easier
to reason about.
This also fixes occasions where items in a grid would leave a bit of
space to the right in the CollectionPage.
Backdrop images in VideoPage and MusicAlbumPage now have a maximum
height of half of the screen, to avoid filling the entire screen in
landscape mode. Perhaps it doesn't always look good, but it makes the
layout more usable.
Images on the SeasonPage and MusicAlbumPage (in landscape) are now
aligned to the right, to avoid blocking the Page back indicator.
Chris Josten