Port to KSortFilterProxyModel

Marco Martinrequested to merge
work/mart/KSortFilterProxyModel into master

Port away from PlasmaCore.SortFilterModel which is going to be removed.

Depends on frameworks/kitemmodels!67 (merged).

Part of https://invent.kde.org/frameworks/plasma-framework/-/issues/19.

Edited by Nate Graham

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