lockscreen: Use more vertical space for notifications

Guido Günther requested to merge guidog/phosh:lockscreen-simplify into main

Was looking at somehting else but the lock screen (one of phosh's earlier widgets) needed some fixup first making it work better with many notifications open:

  • fix inconsistencies regarding clock size between media player widget and notifications
  • use more vertical space for notifications
  • dont cut off notifications below the media widget but move both into the same scrolled window
  • use a revealer for the media player too making it more appealing when it's show / hidden (and consistent with notifications)

Closes: #593 (closed)

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