[WIP]: unify file drop menu and containment
Summary:
very early version of unification of the desktop and folderview drop
menus: use the instance of the qmenu created by the filecopy job, and
send it to the containment to be populated by the extra entries to
create plasmoids/apply wallpaper
Test Plan:
tested only for folderview, work in progress to make it work
with normal desktop containment
Reviewers: hein, Plasma
Reviewed By: hein, Plasma
Subscribers: hein, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D4574