D8008: [Folder View] Turn MenuHelper into a singleton type

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, hein.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  It doesn't store any state but just has methods invoked on it.
  Now we create only one MenuHelper instead of one per applet.

TEST PLAN
  Sort by menu is still working, actions still show up in context menu and desktop toolbox

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D8008

AFFECTED FILES
  containments/desktop/package/contents/ui/FolderViewLayer.qml
  containments/desktop/plugins/folder/folderplugin.cpp

To: broulik, #plasma, hein
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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