Ray-traced Curvature/Pointiness node in Cycles

Right now we have a decent bevel node for cycles that performs a rac-traced bevel, a similar node for pointiness would be helpful for baking out data maps for games development.

We do have a pointiness output from geometry, but that doesn't work for low poly meshes as it determines pointiness/curvature on a per vertex basis, so for example: an optimal cube will have heterogenous curvature across it's entire surface. The mesh needs to be subdivided to yield a decent result.