Best plane fit from points

[f-frhs]

I added Plane.CreateFittedPlaneFrom(points) method with some unit tests for it.

I would like to discuss the following topic:

• [ ] Were testcases I added sufficient?
• implementation
  • [x] which is nice to evaluate? a. (z)axis-aligned distance b. orthogonal distance

[jkalias]

  * [ ]  which is nice to evaluate?
    a. (z)axis-aligned distance
    b. orthogonal distance

I think your implementation is correct, we should evaluate the best fit based on the orthogonal euclidean distance.

[jkalias]

Fixed accuracy test in #218