Closes #786 Asymmetric Chamfer Error

[kolod]

Closes #786 Asymmetric Chamfer Error

cadquery uses random edge face when call into chamfer_builder.Add()

Fix uses face on which edge selected in chamfer_builder.Add() call

Example:

Workplane().box(10, 10, 10).faces("<X").chamfer(1, 2)

If both faces of the edge are selected chamfer now uses length2 for length to prevent unexpected behavior.

Example:

Workplane().box(10, 10, 10).faces("<Y or <X").edges("|Z").chamfer(1, 2)

[adam-urbanczyk]

Thanks for the PR, but looks like you still fail on mypy (annotations) and call show from the test which causes an error on azure. We'll probably need to discuss the proposed semantics too.

[adam-urbanczyk]

@kolod do you intend to work on this?