Add Echolisp, Realbasic, Rebol, Retro, Rtl2 and Xlisp
Fixes: #533 Co-Authored-By: Alexander von Recum <avrecum@users.noreply.github.com>
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Fixes: #533 Co-Authored-By: Alexander von Recum <avrecum@users.noreply.github.com>