Remember scroll position in views

When navigating between artists, albums and tracks the scroll position of previously opened views gets reset when navigating back.

Example

1. In the Artists view scroll down a bit then select an artist
2. Select an Album.
3. Navigate back to the Artists lists.
4. Observe how the Artists list starts with the top-most entry in the list, instead of the previously selected artist.

Expected behaviour

• FFA should remember a previously selected position.
• Positions should not be remembered if the application is closed and reopened