[gnome-photos] (18 commits) ...export-notification, facebook-item: Style fixes

[Debarshi Ray <debarshir src gnome org>]

Summary of changes:

  2288963... utils: Add photos_utils_app_info_launch_uri (*)
  1197c91... base-item: Use photos_utils_app_info_launch_uri (*)
  f63ba8b... base-item: Split the code to encode a GeglBuffer and copy t (*)
  caac055... base-item: Add photos_base_item_save_to_stream_async (*)
  4b7d93e... base-item: Transparently load item in photos_base_item_save (*)
  351b19a... Add PhotosSharePoint (*)
  44f749b... utils: Add an extension point for PhotosSharePoint sub-clas (*)
  3d20b42... Add PhotosSharePointOnline (*)
  33b7268... utils: Add an extension point for PhotosSharePointOnline su (*)
  ec55990... Add PhotosSharePointManager (*)
  e0c9b9c... Add PhotosSharePointGoogle (*)
  84bfd02... Add PhotosSharePointEmail (*)
  4b8f4ee... Add PhotosShareDialog (*)
  730c63e... Add PhotosShareNotification (*)
  d98a655... application: Add share action (*)
  f644a82... selection-toolbar: Add Share button (*)
  9360f92... main-toolbar: Add Share button (*)
  e100929... export-notification, facebook-item: Style fixes (*)

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