Per polls on Twitter, Reddit, Patreon and Tipeee, most people were
willing to drop this plug-in as not being relevant anymore (247 for
dropping and 63 for keeping it, so nearly 80% out of 310 participants).
So let's move it to gimp-data-extras allowing it to still have a
possible life, and who knows, maybe to even evolve.
See also corresponding commit beffc6b to gimp-data-extras repository.
0f7c6285ca