(cherry picked from commit 599acfd5)

(cherry picked from commit 25035a71)

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"

(cherry picked from commit eda1dd58)

this gets us closer to getting rid of the bar entirely

BUG: 266568

prefer lambdas instead

since this fixes some clang style issues as well and the lines gets
touched anyway: also use more auto when newing pointers.

BUG: 461379

- the loadview is now a welcome-style view
- the recent media list has moved from the loadview into the
krecentfiles tech in the menu
- the three play actions are now actual qactions
- the play actions are grouped together in the menu instead of using the
loadview as meta-open view this gives more immediate access to the
actions from anywhere in the app, is more in line with other
applications and frees up the loadview to serve only as welcome view (to
be shown when indeed nothing is playing at all)
- the unused playdialog is no more; along with the newly unused
recentlyplayedlist