Set preliminary numbers for the b&l lenses.
Improved assembly STL.

Replaced ad-hoc-ery with parameters based on the actual visor/user/lens
combination in use.

The result now works for any variant or lens size.
Fix the little angles on the nose slice.
Assembled now works properly with A/B and 25/35.
Merge changes to assembled body shape.

Conflicts:
	visor.scad