Is there anywhere that list the changes made to Quest between version 5.5 and 5.6?

here:

viewtopic.php?f=10&t=5005

I think this is it.

and here's the prior change logs:

http://docs.textadventures.co.uk/quest/ ... notes.html

and try looking at this too:

https://github.com/textadventures/quest

hope this helps.

Many thanks for that link.