[Feature request] Ability to sign out

[slipperybeluga]

Just downloaded this and logged into the wrong account that didn't have access to my music library. I didn't see any way to log out or delete the access token, so I had to uninstall the app and reinstall it to be able to log in with the correct user. It would be nice to have a log out button in the settings.

Big thanks for making this. I have been trying for weeks to get some semblance of reliability with Jellyfin music streaming on my android devices. This is truly exponentially better than the native app.