New version for macOS

Dear all,

After a long hiatus, I resumed creating packages of Gnuplot for macOS. To
avoid problems, many libraries are statically linked. Unlike my older
versions, I now use the wxt terminal, so users no longer need to install
XQuartz.

The webpage for my packages is:
https://csml-wiki.northwestern.edu/index.php/Binary_versions_of_Gnuplot_for_macOS

Version 6.0.2 is available now, although only for Macs with ARM-based
processors. I intend to create an Intel-compatible version in the coming
days.

*Feedback, problem reports, etc. are welcome!*

*Ethan: Can you update http://gnuplot.info/download.html
<http://gnuplot.info/download.html> in two regards?*
- "Various versions through current 5.4:" should be "Various versions
through current:"
-The link in csml-wiki.northwestern.edu is now: "
https://csml-wiki.northwestern.edu/index.php/Binary_versions_of_Gnuplot_for_macOS
"

Thank you!

Erik