The following shortcuts are implemented:
- <Control>? (<Shift><Control>/) to focus the "filter playlists" entry
- <Control><Alt>g to go to the current playlist
- <Shift><Control>p to open the Playlists section
- <Shift><Control>a to open the Artists section
- <Shift><Control>g to open the Genres section
- <Shift><Control>d to open the Decades section
- <Shift><Control>l to open the Libraries section
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>