Merge branch '170-single-track-view' into 'develop'

api/funkwhale_api/music/mutations.py

api/funkwhale_api/playlists/filters.py

api/tests/music/test_mutations.py

api/tests/playlists/test_filters.py

front/package.json

front/src/components/audio/PlayButton.vue

front/src/components/common/RenderedDescription.vue

front/src/components/favorites/TrackFavoriteIcon.vue

front/src/components/library/TrackBase.vue

front/src/components/library/TrackDetail.vue

front/src/components/playlists/TrackPlaylistIcon.vue

front/src/style/_main.scss

front/yarn.lock