librespot stores a more secure token that is valid for a while, rely on this
instead.
On the flip side this requires users to re-enter their login data when their
token has expired.
If the token validity is too short we will have to come up with another
approach, e.g. OS keyrings.
fixes#447
- depend on specific librespot crates to remove clutter
- update versions
this should also help building on openbsd, as the unused librespot-connect
depended on the nix crate, which does not build on openbsd.
