Adding internal support to resolve {@inheritDoc} and format javadoc to plain text for use by jdk.jshell and jdk.scripting.nashorn.shell, enhancing Shift-<tab> documentation in JShell with ability to show javadoc.
Reviewed-by: jjg, rfield
Adding the implementation of the jshell (read-eval-print-loop) tool.
Co-authored-by: Robert Field <robert.field@oracle.com>
Co-authored-by: Shinya Yoshida <bitterfoxc@gmail.com>
Reviewed-by: briangoetz, mcimadamore, psandoz, forax
