[ ] Move "functional" operations from geometry to geometry/functional
[ ] Move "functional" kernels (including ones for warping) from geometry/kernel to geometry/functional/kernel. This will include WarpUtilties.h, which may be used from within files in geometry/kernel.
[ ] Move "functional" code and kernels from rendering to rendering/functional
geometrytogeometry/functionalgeometry/kerneltogeometry/functional/kernel. This will include WarpUtilties.h, which may be used from within files ingeometry/kernel.renderingtorendering/functional