[gtk] (13 commits) Non-fast-forward update to branch wip/baedert/for-master

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/for-master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  f5c8b13... switch: Stop using a private struct
  653dd0f... bookmarksmanager: Stop exporting get_xdg_type
  b5232f3... Rename gtkbookmarkmanager.h to gtkbookmarksmanagerprivate.h
  5fcc6f1... headerbar: Don't update window buttons when unrealized
  965343d... widget: Inline build_finalize_assertions into only caller
  7a20762... native: Don't compare a pointer with 0

Commits added to the branch:

  135cea7... GtkBuildableParser: Add a wrapper for GMarkupParser (*)
  96b37f4... Use the new GtkBuildableParser type in GtkBuildable interfa (*)
  ff23397... GtkBuilder: Add support for precompiling builder xml (*)
  73042bf... GtkWidget: Precompile template xml on class creation (*)
  76103ee... GtkBuildable: Fix indentation (*)
  60f2e45... switch: Stop using a private struct
  ed11f2a... bookmarksmanager: Stop exporting get_xdg_type
  ce72154... Rename gtkbookmarkmanager.h to gtkbookmarksmanagerprivate.h
  3a06394... headerbar: Don't update window buttons when unrealized
  8ec1c86... widget: Inline build_finalize_assertions into only caller
  32b84b8... native: Don't compare a pointer with 0
  6aeee3e... Add GtkCenterLayout
  c72a971... headerbar: Use a center layout

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