Layout the bones of a sliding Contour algorithm that runs in a single pass.

We are going to avoid a second pass by doing 64 z-layers at a time, and
storing the results into a fixed buffer that we compact.
Subdivide the contour into slices. Now working on the pre-allocated contour alg.
Properly implement a fast sliding contour.

Still need to defer point interpolation to get even better speeds.
Improve speed at which we create of the vtkPolyData
Correct bugs in timer logs.
Style cleanup and slightly faster kernel.