The gleep/allow bottom aligned d4 numbers

[Earl-Brown]

As I get older, it's tougher to see the little numbers at the top of a D4. Plus, when I tried designing my own (before I found this wonderful repo!), I tended to have the numbers "overlap" each other.

Once I realized the power of this tool, I decided I had to have the "bottom aligned numbers on a d4" option. So I put it in there. Gotta love open source!

• Added "Place numbers on bottom" checkbox to the D4 UI
• Added properties to store the checkbox state in
• Revised numbers.ts to decide rotations based on the checkbox state (this code is not that clean - mostly a copy-and-paste of what was already there and tweaked the calculations a little)
• Changed FACE_MAP in D4FaceGeometry to be the retrieved based on the checkbox state instead of being hard-coded.
• Also in D4FaceGeometry, I added a Z rotation so the numbers are right-side-up. (The value 3.1 was found through trial-and-error rather than any actual math skills. If the math says it should be something different, it's a change worth adding in!)
• Changed the UI rotation factor to .5 (5x what it was) because it was WAY too slow trying to examine the results of my changes!

[Earl-Brown]

I am rescinding this pull request because @HeuristicBishop has cleaner code