D24265: support global edit mode

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  desktop and panel toolboxes are only visible in "edit mode"
  edit mode can be triggered by
  
  - long press in desktop
  - context menu action
  - dbus property (to be eventually used by systemsettings)
  
  The desktop toolbox becomes a "toolbar" with just few selected actions
  the presence of that toolbar both fullfills "long press should usually show some 
  contextual actions" and being a very visible hint that "we are now in edit mode"
  toolbox is still movable around in case would obscure any important stuff where it's 
  by default
  depends from D24263 <https://phabricator.kde.org/D24263> and D24264 <https://phabricator.kde.org/D24264>

TEST PLAN
  ui works as planned, toolbox position is saved and restored correctly

REPOSITORY
  R119 Plasma Desktop

BRANCH
  mart/editMode

REVISION DETAIL
  https://phabricator.kde.org/D24265

AFFECTED FILES
  containments/desktop/package/contents/ui/main.qml
  containments/panel/contents/ui/main.qml
  toolboxes/desktoptoolbox/contents/ui/ToolBoxButton.qml
  toolboxes/desktoptoolbox/contents/ui/ToolBoxItem.qml
  toolboxes/desktoptoolbox/contents/ui/ToolBoxRoot.qml
  toolboxes/paneltoolbox/contents/ui/main.qml

To: mart, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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