Draft: wsi/display: Implement HDR support for on KHR_display
- Brings in libdisplay-info for parsing EDIDs
- Parses hdr metadata + colorimetry info out of the EDID
- Exposes HDR surface formats conditionally
- Sets Colorspace and HDR_STATIC_METADATA properties on the DRM connector based on Swapchain state (tracked via a global id for the 'color outcome')