* Make authentication part of the server, so it can be reused outside the Native API
This commit has broken tests after a rebase
* Serve frontend assets from `server`, and not from Native API
* Change Native API URL
* Fix auth tests
* Refactor server authentication
* Simplify authProvider, now subsonic token+salt comes from the server
* Don't send JWT token to UI when authenticated via Request Header
* Enable ReverseProxyWhitelist to be read from environment
Deluan Quintão