add more GM Emulators

[stevesea]

Mike Overbo has excellent summary of a bunch here:

https://bobloblawssolologblog.blogspot.com/2017/04/solo-engines-advice-to-myself-from-time.html

http://www.drivethrurpg.com/product/114895/Black-Streams-Solo-Heroes

Mike's ranDM is great!

https://www.rpgsolo.com/play.php

http://dieheart.net/useful-stuff/solo-rpg-resources/#solo-tools