D14830: Add "Display Configuration" context menu entry on the desktop

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, VDG, fischbach.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  One of LiMux client's requirements is for display configuration to be easily accessible.
  Adding a "Display Configuration" context menu entry which is widely known by being present on another operating system aids in users finding those settings.
  It also gets asked for occasionally by users on the internet.
  Since this has been quite a controversial topic coming up every couple of years, the entry is off by default but can be enabled by the user if so desired or by system administrators using desktop scripting.

TEST PLAN
  - Only shows up if kscreen is installed
  - Doesn't show up if restricted by KIOSK
  - Enabling and disabling works
  - Clicking it opens the screen settings
  
  Context Menu
  F6192834: Screenshot_20180814_150003.png <https://phabricator.kde.org/F6192834>
  Menu Settings (Configure Desktop → Mouse Actions → Standard Menu → [Settings button])
  F6192836: Screenshot_20180814_150041.png <https://phabricator.kde.org/F6192836>

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D14830

AFFECTED FILES
  containmentactions/contextmenu/menu.cpp
  containmentactions/contextmenu/menu.h

To: broulik, #plasma, #vdg, fischbach
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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