feat: Color Interop IDs and related color space improvements

[brechtvl]

Discussion is happening in #4787 and various pull requests. This is an issue to keep track of concrete tasks and design decisions (not as another place for discussion).

Color Interop IDs

• Scene referred color interop IDs support in I/O
• feat: Support display color space interop IDs in I/O #4972
  • Prefer display referred interop IDs over scene referred on read
  • Special exception for Gamma 2.2 display?
• feat: Make color interop IDs work with older OpenColorIO ACES configs #4971
• Do or do not write interop IDs for scene referred?
• Default to scene referred interop IDs for texture system and maketx?
  • Preference as config instead of global attribute, for multithreaded apps (part of feat: Support display color space interop IDs in I/O #4972)
  • Change make maketx defaults?
  • Change texture system defaults? But how, ImageCache is used for other things.
• Changes needed for namespaced interop IDs
• Look up interop IDs in default config if current config does not have them

Color Space Metadata

• OpenEXR colorInteropID
  • Read support
  • feat(exr): Write OpenEXR colorInteropID metadata based on oiio:ColorSpace #4967
• CICP
  • feat: Auto convert between oiio:ColorSpace and CICP attributes in I/O #4964
  • PNG support
  • HEIF support
  • feat(JXL): CICP read and write support for JPEG XL #4968
    • Handle more interop IDs through custom primaries, white point and gamma.
• ICC profiles
  • Use ICC profile associated with color spaces in OCIO 2.5 configs in image writing
  • Bundle ICC profiles for display interop IDs and automatically write them to file?
  • Read cicpTag from ICC profile, or other ways to detect interop ID from ICC profile?
  • Determine interop ID from ICC profile by comparing OCIO transforms?
• Deferred and unified resolution of color interop ID from metadata

HDR Metadata

• Mastering Display Color Volume metadata read and write
• HDR reference white metadata read and write (SMPTE ST 2094-50)