A template for `jsdoc` that generat the HTML5 public classref.
The script can be run via `npm run docs` to print to stdout.
You can dry run via `npm run docs -- --d dry-run` or write to file via
`npm run docs -- -d /path/to/file.rst`
Also update Makefile in `doc/` and add dry run test to CI.
Applies to javascript files inside the platform library folder, the
exposed Engine code, and any javascript files in modules.
Files ending with ".externs.js" will be ignored, you can create a
".eslintignore" file to specify extra files to be ignored.
