Fix player serialization

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
Fix trailing spaces in documentation

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
Handle empty state of search UI

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
First working version of playlist UI

Signed-off-by: Lars Kiesow <lkiesow@uos.de>