New sub-scene to Chapter 6 Part 3

Hello everyone!

I'm adding a new optional sub-scene to Chaper 6 Part 3, and it's taking longer than I initially planned. I designed around 35 renders so far (and they are not rendered yet), so it will take a few days for me to finish them.

Having said that, I decided to release the current Alpha version (v0.32.1a) to Beginner Patrons by the end of this week, while I keep working on the Beta version (v0.32.2b), which will be released to Advanced Patrons in a few days (most likelly after the weekend...).

Cheers!