[applet] Port mostly to PlasmaComponents3
Tested; no regressions. The new remaining things that still need PC2 are
now labeled with the reason in the import line so you can easily see by
doing a grep org.kde.plasma.components 2.0
in the repo.
Tested; no regressions. The new remaining things that still need PC2 are
now labeled with the reason in the import line so you can easily see by
doing a grep org.kde.plasma.components 2.0
in the repo.