Dolphin: Cleanup kcms
Summary: Refactor forearch, adjust formatting, remove unnecessary version checks.
Test Plan: Compiles
Reviewers: Dolphin, ngraham, elvisangelaccio, meven
Reviewed By: Dolphin, ngraham
Subscribers: kfm-devel
Tags: Dolphin
Differential Revision: https://phabricator.kde.org/D29377