[Media Frame] Port "Paths" category to QQC2+Kirigami and modernize UI

Summary:
- Port to QQC2
- Use Kirigami `SwipeListItem` for the paths view
- Use standard import names
- Put the buttons below the lists to follow the general style

Test Plan: {F6821837}

Reviewers: #vdg, #plasma, ndavis

Reviewed By: #vdg, ndavis

Subscribers: ndavis, plasma-devel

Tags: #plasma

Maniphest Tasks: T10586

Differential Revision: https://phabricator.kde.org/D21191