Fix #576: Improved keyboard accessibility on player, queue and various controls

changes/changelog.d/576.enhancement

front/src/App.vue

front/src/components/Pagination.vue

front/src/components/Sidebar.vue

front/src/components/audio/PlayButton.vue

front/src/components/audio/Player.vue

front/src/components/audio/album/Widget.vue

front/src/components/audio/track/Row.vue

front/src/components/audio/track/Table.vue

front/src/components/audio/track/Widget.vue

front/src/components/favorites/TrackFavoriteIcon.vue

front/src/components/playlists/TrackPlaylistIcon.vue

front/src/components/playlists/Widget.vue