Adding tons of Cell tests with metrics

Until I figure out how to match the C++ Subdivide, I've opted to use
CellFromCellID on cell children. Supposedly slower but at least it works.

Out of all this work I only have a _single_ test case failing and I'm
not sure why. It's the MaxArea metric and the difference is tiny
(e.g. 9.36424007478522e-15 > 9.364012772742995e-15).

I also updated the metrics to use the quadratic projections since that's
what stToUV() uses.