Add support for JEP 467: Markdown Documentation Comments coming in Java 23

[jmax01]

Add support for JEP 467: Markdown Documentation Comments coming in Java 23.

Eclipse native support is being tracked here.

[mnlipp]

I'm using jautodoc for many, many years now. Just how much it has simplified my documentation tasks has become apparent when I made my first attempt to switch from https://mnlipp.github.io/jdrupes-mdoclet/javadoc/ to Java 23 markdown. I know it isn't that simple, but I'd love to see a switch for generating Java 23 markdown comments instead of the old fashioned comments in jautodoc.

[mkesting]

Hi, I will work on this. But it will take some time...

[jmax01]

Hi, I will work on this. But it will take some time...

I cannot begin to tell you how helpful this project has been to me over the past 15 years.