Make a public documented command out of _fx_stylize

[myselfhimself]

Hello, I do not always like to make G'MIC images myself from scratch, for G'MIC tutorials especially. So the sp/sample command is awesome, except for people behind a proxy in a strangely configured machine.

This is also a bit the same for the paintings of _fx_stylize ; people discovering G'MIC most probably like use famous very different paintings they have implicitly recorded in their mind throughout their mind. The command is so far undocumented, is has no public command counterpart for now, and the two ways I have been using to find its possible parameters (looking up in https://raw.githubusercontent.com/dtschump/gmic/master/src/gmic_stdlib.gmic or https://gmic.eu/gallery/stylization.html) are hackish.

How about adding a public documented command akin to sample, for _fx_stylize, in the G'MIC stdlib? Such as sample_paintings spp or sample_artwork spart (or spa) ?

Cross-posting this on pixls.us for community feedback

[myselfhimself]

Related pixls.us post: https://discuss.pixls.us/t/making-fx-stylize-a-public-command-like-sample-sp/21399