D15466: Add Wayland touch drag and drop support

romangg created this revision.
romangg added a reviewer: KWin.
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REVISION SUMMARY
  Use the new functionality in KWayland to support drag and drop via touch
  screens.
  
  Either a drag and drop session with pointer or touch is possible, but not
  both at the same time. Pointer/touch gets deactivated if a touch/pointer
  drag and drop session is active.

TEST PLAN
  Manually. Autotest planned.

REPOSITORY
  R108 KWin

BRANCH
  touchDragSupport

REVISION DETAIL
  https://phabricator.kde.org/D15466

AFFECTED FILES
  input.cpp

To: romangg, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart