[gimp] (3 commits) Non-fast-forward update to branch wip/nielsdg/g-define-boxed-type

[Niels De Graef <nielsdg src gnome org>]

The branch 'wip/nielsdg/g-define-boxed-type' 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:

  86a2405... app: Use G_DEFINE_BOXED_TYPE()
  30afc3b... libgimpbase: Use G_DEFINE_BOXED_TYPE()
  b0e6d69... libgimpmath: Use G_DEFINE_BOXED_TYPE()

Commits added to the branch:

  ab3f8d6... app: Use G_DEFINE_BOXED_TYPE()
  0700a78... libgimpbase: Use G_DEFINE_BOXED_TYPE()
  bd1b718... libgimpmath: Use G_DEFINE_BOXED_TYPE()