* dont send bitrate/etc as null when should be undefined
* set user flags to number instead of string
* send empty 'threads' in identify when not using new state v2
- Aded /users/@me/connections/:connection_name/:connection_id/access-token
- Replaced `access_token` property on ConnectedAccount with `token_data` object for refreshing tokens
- Made a common interface for connection things like ComonOAuthTokenResponse
- Added `RefreshableConnection` class
- Added token refresh to Spotify connection (disabled)
* Add script to automatically add license to each file
* Add license preamble to each file.
* Fix existing preamble detection breaking due to line endings. Git :(
* Prevent license from being added to code with other licenses