[gtk] (16 commits) ...emojichooser: Add profiler marks for loading

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  ed742f1... testperf: Allow measuring start time (*)
  b7b2510... testperf: More flexible mark selection (*)
  85ad943... placessidebar: Change some initial property values (*)
  1e6171a... Read bookmarks async (*)
  ed6c0dc... Don't export color picker functions (*)
  005ea7a... entry: Avoid criticals in dispose (*)
  47c21a2... textview: Don't update action state in dispose (*)
  b1d5de7... notebook: Don't trigger criticals in dispose (*)
  955305a... treestore: Silence compiler warnings (*)
  9e6ae7a... gdk: Silence some compiler warnings (*)
  9a446f2... frameclock: cosmetics (*)
  1cb575a... icontheme: Remove some dead code (*)
  b996b85... Add a lib64 variant of gtk.supp (*)
  fac435b... widget: Fix a memory leak with class actions (*)
  25c25ba... icontheme: Fix various memory leaks (*)
  54f6515... emojichooser: Add profiler marks for loading (*)

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