video: HDR display/output support (BT2020 / DCI P3) (#718)
* Merge branch 'hdr' of https://github.com/wickerwaka/Main_MiSTer into feature-hdr Merged in wickerwaka's old HDR branch and integrated the BT2020 and DCI P3 color space conversion matrices. Changed "hdr" option to be a selection of matrix instead of saturation option. * Add HDR example to MiSTer ini
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