Colour-hdri

Features

`colour_hdri.models`
- Implement support for _Adobe DNG SDK_ colour processing with `colour_hdri.xy_to_camera_neutral`, `colour_hdri.camera_neutral_to_xy`, `colour_hdri.XYZ_to_camera_space_matrix` and `colour_hdri.camera_space_to_XYZ_matrix` definitions. (kelsolaar)

`colour_hdri.recovery`
- Implement `colour_hdri.highlights_recovery_LCHab` definition performing highlights recovery in _CIE LCHab_ colourspace. (kelsolaar)

Changes

`colour_hdri.utilities`
- `colour_hdri.linear_conversion`: (kelsolaar)
- Remove and replace with `colour.linear_conversion`.

This release is a compatibility release with [Colour 0.3.8](https://github.com/colour-science/colour/releases/tag/v0.3.8)

Features

`colour_hdri.sampling`
- Implement `colour_hdri.light_probe_sampling_variance_minimization` definition sampling given light probe to find lights using Viriyothai (2009) variance minimization light probe sampling algorithm. (kelsolaar)

Initial release for [Colour - HDRI](https://github.com/colour-science/colour-hdri/). (kelsolaar)