Resolve "Support browsing a specific library content"
Closes #926 (closed)
This brings several enhancements:
- A new detail screen for library that allows you to browse the library content (if it's public / followed): artists, tracks and albums
- A better experience with library sharing links. Pasting the URL in a browser will not return JSON anymore, but redirect to the library detail screen
- Moved library-related forms (edition, upload) on this new screen for consistency)