Playlist control and UI improvements
- Ability to create, delete and rename playlists;
- Ability to add and remove tracks from a playlist;
- Shorter control description with ability to show all keys;
- Search has been expanded to search by albums and playlists (configurable behavior, disabled by default);
- Automatically hides the side panel when the window becomes too narrow;
- Fixed various bugs with jumping and overflowing UI.
Note
Added new fields in config file. Refer to the READEME.md for a new config template.