[gtk/matthiasc/for-master] (17 commits) ...testframe: Drop padding

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  43a453e... headerbar: Remove has-subtitle property (*)
  67822d0... appchooserdialog: Create title and subtitle manually (*)
  fa0509c... filechooserdialog: Create title and subtitle manually (*)
  35d50f8... headerbar: Remove subtitle (*)
  c2e4e1a... headerbar: Remove user-settable title (*)
  739f681... headerbar: Rename custom-title to title-widget (*)
  6b4bed2... builder-tool: Rename GtkHeaderBar:custom-title to title-wid (*)
  ab59562... headerbar: Document GtkBuilder child types, add a title exa (*)
  c31431c... Update Basque translation (*)
  fa90747... Merge branch 'wip/exalm/headerbar-title' into 'master' (*)
  fd1fe0e... Merge branch 'matthiasc/for-master' into 'master' (*)
  32740a7... Update Ukrainian translation (*)
  80867ac... appchooserdialog: Don't show subtitle label when subtitle i (*)
  0b4a1bb... Merge branch 'wip/exalm/subtitle' into 'master' (*)
  77cf6cd... frame: Don't queue a resize if xalign changes
  130ae89... frame: Fix xalign handling
  92ac66f... testframe: Drop padding

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