Draft: TF and Chromaticity updates

This MR is proposing changes to the transfer functions and chromaticities. We propose to rename OETF to TF, merge chromaticities with whitepoints, drop a couple enums from TF and chromaticities, and add a few TFs and chromaticities.

Even though it wasn't a direct guide for these patches, it might be helpful to refer to this doc on how one other OS describes color space and transfer functions: https://docs.microsoft.com/en-us/windows/win32/api/dxgicommon/ne-dxgicommon-dxgi_color_space_type