[gtk] (11 commits) ...Merge branch 'header-cleanup' into 'main'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  61a51de... gdk: Dissolve gdk-autocleanup.h (*)
  3688ece... gsk: Dissolve gsk-autocleanup.h (*)
  f141da6... gtk: Dissolve gtk-autocleanup.h (*)
  c24a695... Rename gdkdebug.h to gdkdebugprivate.h (*)
  7d2c296... Rename gdkconstructor.h to gdkconstructorprivate.h (*)
  a8af7ca... Rename gdk-private.h to gdkprivate.h (*)
  4aabc45... Drop gdkintl.h (*)
  e499a09... Drop gtkintl.h (*)
  9ff5497... gdk: Tweaks to keyname handling (*)
  bc661a8... gdk: Rename gdkpixbuf-drawable.c (*)
  cefb0a3... Merge branch 'header-cleanup' into 'main'

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