Ytmusicapi

Changes
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- Fix upload metadata and file types (fixes 1) - now metadata of uploaded files will be recognized by Google (picture, artist, etc). Additionally, flac, ogg and all other file types for Google should work
- Fix setup header length check (setup should not return an error anymore)
- Search edge case: sometimes contents is missing from API response (this is an issue on the YT Music side - now handled correctly by the API)

Changes

- Add authentication check to validate provided credentials
- Remove need for X-Youtube-Identity-Token in credentials
- Fix upload
- Update docs

Changes

- New features: Add upload_song, get_uploaded_songs, delete_uploaded_song
- Simplified setup with CLI tool to create headers_auth file
- Moved tests to unittest
- Removed print output for continuations in get_playlist_items
- Fixed unplayable playlist item parsing

- Unplayable songs in playlists now correctly return videoId and setVideoId
- Search is now compatible with accounts that have uploads

Update docs