LLICF v1.7.0
  - llicf_decode writes images of YCbCr tracks as 8-bit RGB, with the matrix, range and chroma
    siting the track records, else those of most video
  - LLICF_DECODER_HIGH_PLANES (API 1.7) leaves the low planes of deep tracks out of every
    definition, also through the reader, and holds no memory for them
  - llicf_convert.py names the Cb and Cr planes of YCbCr tracks in its summary
  - Needs LLIC 4.3, whose YCbCr to RGB helpers llicf_decode uses

See CHANGELOG.md for more details.