Missing WIC features

Tracking issue for features that WIC has but WPF does not.

• plenty of built-in pixel formats #4570, most importantly:
  • WICPixelFormat32bppRGBA used by built-in WEBP #1436
  • WICPixelFormat96bppRGBFloat used by built-in TIFF
  • big groups of unsupported formats:
    • 10-bit
    • fixed point
    • half float
    • CMYK
    • n-channels
• support for add-in pixel formats
• enumererating available:
  • decoders and encoders #7930
  • metadata readers and writers
  • pixel formats and converters
• classes for new or updated built-in codecs:
  • JPEG XR #6337
  • DDS (with its own interfaces)
  • DNG
  • HEIF (with its own metadata interfaces) #6337
  • WEBP (with its own metadata interfaces) #6337
  • recognize new PNG codec CLSIDs
  • new JPEG properties (IWICJpegFrameDecode, IWICJpegFrameEncode)
• IWICDevelopRaw #4567
• IWICCodecProgressNotification
• allow developres to add managed classes for their WIC components
• allow developers to supply non-WIC based codecs https://github.com/dotnet/wpf/issues/1436#issuecomment-562444330
  • allow developers to read and write metadata
• progressive decoding IWICProgressiveLevelControl