Implement user login

[jaylinski]

Description

As a SoundCloud plugin user I want to be able to login to my user account, so I can see my own music and other details from my profile page.

Acceptance criteria

• [ ] A Login item is shown in the root view if no user is authenticated
• [ ] If the Login item is selected, a user can authenticate with a username and password
• [ ] If a user is authenticated, a My profile item is shown in the root view
• [ ] If a user is authenticated, a Logout item is shown in the root view
• [ ] If the My profile item is selected, a list with the items Stream, Liked tracks, Playlists, Albums, Following, Stations and Listening history is shown

Notes

This should enable users to listen to full tracks.

Related to #51.

[TheWorms]

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