Video Downloading & Offline playback

[kuylar]

Details

Adds downloading videos and the ability to watch them while offline

Implementation Status

• [x] Downloading videos
• [x] Library section for downloaded videos
• [ ] Watching downloaded videos
• [ ] Pausing/cancelling ongoing downloads

[kuylar]

both android DownloadManager and ExoPlayer DownloadService let me down (DownloadManager can't download to context.filesDir and DownloadService acts weird and crashes if you get the download statuses a little too much)

im going insane ill have to write a whole download service by myself