Align Face: slide mode error when one or more sliding edges are coplanar with the rotation plane

[JohnKazucki]

Plane intersection doesn't work in this case and returns None

[JohnKazucki]

fixed during refactor in 824c6b9d34d2f4e114bcb008569c09d4f0afdbc5

[JohnKazucki]

won't give error anymore, but instead sets verts without a proper new location to 0,0,0

default their slide direction to the orientation direction normal instead. See #19 for feature enhancement

[JohnKazucki]

fixed in 105dc42