More ePub fixes, and azw3 version

As part of continued accessibility efforts, we now have an azw3 ebook version.  

Also, as part of creating that file, I made some small updates to the ePub version as well for better image alignment and the like.   As usual, the All Files zip has been updated with the new versions, but those are the only changes.

Hopefully soon, I should have a couple of mini-expansion items available for download as well!

Happy Solstice!