[gtk] (17 commits) ...Merge branch 'dnd-cleanups' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  b94c316... dnd: Rename gtk_drag_begin_with_coordinates (*)
  63ab523... wayland: Remove an unused field (*)
  db0b9f6... dnd: Add a GdkDrag::action property (*)
  f69bb2f... wayland: set a cursor when starting a drag (*)
  40841ec... GdkDrag: Drop the priv struct (*)
  94af080... Rename a property (*)
  59c2efb... Add a GdkDrag::actions property (*)
  d927c3b... GdkDrop: drop the priv struct (*)
  7a0a92f... win32: Stop using gdk_drag_get_suggested_action (*)
  da22ba3... drag: Split a setter (*)
  a756caa... dnd: Drop suggested_action (*)
  c73cb2c... wayland: Drop an unused field (*)
  0e2ac0e... wayland: Rename a source file (*)
  5cdbbc6... win32: Build fixes (*)
  1dd15b5... dnd: Some documentation updates (*)
  f432c93... dnd: Drop gdk_drag_abort (*)
  986daa8... Merge branch 'dnd-cleanups' into 'master'

(*) This commit already existed in another branch; no separate mail sent