Clean up GdkDragContext api
Tasks:
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Rename GdkDragContext to GdkDrag
Make the api not suck
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Replace ::action-changed with an action property -
Clarify difference between actions, suggested-action and selected-action -
Get rid of drop_done as public api
Fix some fallout
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Reinstate local dnd -
Make X11 run transformation steps mime-type <> atom