attr: refactor colourspace conversion to support other formats
This commit enables signalling a colour matrix index using cicp_matrix_coefficients_idx (ISO/IEC 23001-8 codec independent code points). It adds the following options that replace the existing colorTransform option: - colourMatrix: The coded representation according to ISO/IEC 23001-8. - convertPlyColourspace: Enables conversion to/from RGB using the indicated matrix. Configuration files are updated to use the new option and to signal the identity matrix in the case of direct GBR coding.
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