[gimp] (19 commits) Non-fast-forward update to branch wip/simon/palettestuff

[Simon Budig <simon src gnome org>]

The branch 'wip/simon/palettestuff' 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:

  5b00847... Get rid of image->n_colors and image->colormap
  97af7aa... remove the ->position entry from GimpPaletteEntry

Commits added to the branch:

  5520b55... NEWS: update. (*)
  d4392d0... Update Catalan translation (*)
  e5aa146... docs, etc: regenerate the default gimprc and its manpage. (*)
  82391c1... devel-docs: some updates to release-howto.txt (*)
  588626d... desktop: update appdata with dates. (*)
  d89f28d... Update/fix Russian translation (*)
  b1abc5b... app: improve Paint Select Tool description. (*)
  9fc87b8... authors: update the authors list. (*)
  db996f2... Release development version GIMP 2.99.4. (*)
  72effc5... configure.ac, meson.build: post-release version bump to 2.9 (*)
  50a0f49... devel-docs: some small release-howto updates. (*)
  b38d55b... Update Ukrainian translation (*)
  73252da... GIR: Add some missing (nullable) annotations (*)
  bba70f5... gimpparamspecs: Add annotations about array length (*)
  e34c051... gimpintcombobox: Add (array length) annotation (*)
  df28349... GIR: Try to return more specific GtkWidget subclass (*)
  c21859e... Issue #6142: plugin crash exporting as jpg. (*)
  4c6d1c7... Get rid of image->n_colors and image->colormap
  1bade08... remove the ->position entry from GimpPaletteEntry

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