macosx: Add library-based playlist queueing when playing media library items

This MR adds additional items besides the selected one based on the context in which the item was selected for playback. For instance, when selecting a song in an album, the following tracks on the playlist will also be added in turn. Similarly, when playing a song in the library, the following songs in the library will be added.

Screen_Recording_2023-11-03_at_15.22.17 Screen_Recording_2023-11-03_at_15.23.28

This behaviour can be changes through a menu entry called "Library Playlist Mode"

Signed-off-by: Claudio Cambra developer@claudiocambra.com