D11150: Use Kirigami's spacing and icon sizes and remove own implementation

[Mark Kretschmann]

markey closed this revision.

REPOSITORY
  R181 Amarok

REVISION DETAIL
  https://phabricator.kde.org/D11150

To: malteveerman, #amarok, markey
Cc: markey, #amarok, nhuisman, paul, yaohanchen, malteveerman, cochise, 
tbettler, Smar, ricktimmis, asturmlechner, schweingruber, heikobecker