[gimp] (50 commits) ...gitlab-ci: don't use mypaint-brushes from Archlinux.

[Jehan <jehanp src gnome org>]

Summary of changes:

  4db8cda... app, pdb, libgimp: add a new GimpImage class for plug-ins. (*)
  bb72504... libgimp: change all non-generated API to use GimpImage. (*)
  688c323... libgimp: create and use gimp_image_new_by_id(). (*)
  17a40b0... libgimp: generate functions both for old and new GimpImage  (*)
  fec6034... pdb: keep both the old and new API alive. (*)
  09f0530... libgimp: update non-generated API to allow old and new API. (*)
  e0d50aa... plug-ins: keep building all plug-ins with old API. (*)
  793cba6... libgimp: allow object GimpImage as procedure parameter. (*)
  79b319c... libgimp, pdb: add GimpItem > GimpDrawable > GimpLayer class (*)
  3f1491e... libgimp: update non-generated API using GimpItem/GimpDrawab (*)
  433fcd4... plug-ins: ported a few plug-ins to new GimpImage/GimpDrawab (*)
  8249afe... libgimp: allow object GParamSpec for GimpItem and child cla (*)
  52811ed... plug-ins: C goat-exercise now ported to new GimpImage/GimpD (*)
  9b8f608... plug-ins: port JavaScript goat-exercise to new GimpImage AP (*)
  292b697... plug-ins: use GimpDrawable class in Python goat-exercise. (*)
  8c95499... pdb, libgimp: now make all ID types classes of their own. (*)
  5e6d4d8... libgimp: fix the non-generated API with the new class types (*)
  c409829... libgimp, pdb: no need to create deprecated versions for pri (*)
  75f8a38... libgimp: nicer API for functions returning a list. (*)
  a1eeca4... libgimp: support all GimpItem subclasses as argument and re (*)
  ee8b467... libgimp: GimpSaveProcedure() now uses GimpImage/GimpDrawabl (*)
  7f91f6b... libgimp: GimpImageProcedure now uses GimpImage/GimpDrawable (*)
  0fa0928... plug-ins: port file-ico to the new GimpImage/GimpDrawable o (*)
  abd4d6f... plug-ins: port file-pat to GimpImage/GimpDrawable. (*)
  d6365c7... plug-in: port file-gbr to GimpImage/GimpDrawable. (*)
  0cb995e... plug-ins: port file-gih to GimpImage/GimpDrawable. (*)
  3e636ba... plug-ins: port file-desktop-link to GimpImage/GimpDrawable. (*)
  e29cb03... plug-ins: port file-compressor to GimpImage/GimpDrawable. (*)
  c95e933... plug-ins: port file-raw plug-ins to GimpImage/GimpDrawable. (*)
  8559cee... plug-ins: improve parameter creation on Python 3 goat-exerc (*)
  cfd30ec... libgimp: s/gimp_image_new_by_id()/gimp_image_get_by_id()/ (*)
  d15388c... libgimp: s/gimp_display_new_by_id/gimp_display_get_by_id/ (*)
  08849a5... libgimp: GimpItem now also belong to libgimp. (*)
  3d4bf19... plug-ins: port file-sgi to GimpImage/GimpDrawable. (*)
  1b6e6b9... plug-ins: port file-exr to GimpImage/GimpDrawable. (*)
  0b64395... plug-ins: port colormap-remap to GimpImage/GimpDrawable. (*)
  9f0dbb5... plug-ins: port screenshot to GimpImage/GimpDrawable. (*)
  8f34af4... plug-ins: port file-png to GimpImage/GimpDrawable. (*)
  adc4f8e... plug-ins: port mail to GimpImage/GimpDrawable. (*)
  e6b141f... plug-ins: port file-tiff to GimpImage|Drawable|Vectors, etc (*)
  6db115e... plug-ins: unit-editor does not need GimpImage porting. (*)
  7838c7f... plug-ins: port fractal-explorer to GimpImage|Drawable. (*)
  962e8b9... plug-ins: port gfig to GimpImage|Drawable. (*)
  00e7507... plug-ins: port print to GimpImage/GimpDrawable/etc. (*)
  3e06295... plug-ins: port pagecurl to GimpImage/GimpDrawable. (*)
  bbf90b3... plug-ins: port film to GimpImage/GimpDrawable. (*)
  6e68f18... plug-ins: port file-ps to GimpImage/GimpDrawable. (*)
  2d0584d... plug-ins: port file-psd to GimpImage/GimpDrawable. (*)
  899cf96... libgimp: make sure gimp_item_get_by_id() allocates the righ (*)
  3b5bc9f... gitlab-ci: don't use mypaint-brushes from Archlinux. (*)

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