* implementation of a proposal from during Wintercamp:
  - with SHIFT-LMB drag of area corner the area gets
    duplicated into a new window.
    This is the old "Rip Area" operator with a new,
    better name. The old menu and hotkey are now gone.
    This means we have currently split, join and now
    duplicate/copy area into new window in the area
    actionzones.