Update Exoplayer all the way to 2.18.1

app/build.gradle.kts

app/src/main/AndroidManifest.xml

.../main/java/audio/funkwhale/ffa/activities/MainActivity.kt

...java/audio/funkwhale/ffa/playback/MediaControlsManager.kt

...rc/main/java/audio/funkwhale/ffa/playback/MediaSession.kt

app/src/main/java/audio/funkwhale/ffa/playback/PinService.kt

...c/main/java/audio/funkwhale/ffa/playback/PlayerService.kt

...rc/main/java/audio/funkwhale/ffa/playback/QueueManager.kt

...java/audio/funkwhale/ffa/repositories/SearchRepository.kt

...java/audio/funkwhale/ffa/repositories/TracksRepository.kt

app/src/main/java/audio/funkwhale/ffa/utils/Extensions.kt

...src/main/java/audio/funkwhale/ffa/views/NowPlayingView.kt