Plasma applet: align logic more with kdeplasma-addons "Konsole Profiles"
- use PlasmaComponents.ItemDelegate instead of manual Item & MouseArea
- wrap listview in ScrollView instead of manual scrollbar setup
- use Kirigami unis for spacing
- use system trigger key instead of hardcoded Enter & Return keys
Also separate commits for some metadata update and more modern SvgItem usage.
Tested with plasmoidviewer --applet org.kde.kdevelopsessions
against kdevelop/kf6 as well as using with my normal user in Plasma6 session against kdevelop5 :)
Edited by Friedrich W. H. Kossebau