Snap shape and translate ray to nearest vertex on axis

[gabrielw-us]

Visual Ideas:

• When snapping, change ray and guidelines a nice complementary (to the default blue) orange-ish color.
• Guidelines most important, could leave the ray color as-is.
• Perhaps also hide the grid entirely when snapping

Tough to call any of these until we can see them

Additionally, could also highlight the actual edge/vert being snapped to, but that gets complex, too much for Alpha1 maybe.