Add support for binary complement to sign-magnitude conversion transformation (NLT)

[palemieux]

HTJ2K is ideally suited to compress floating-point pixel values found in image formats like TIFF and EXR.

Suggest adding support for binary complement to sign-magnitude conversion transformation (ISO/IEC 15444-2, K.2.3), which includes support for parsing/writing constrained NLT marker segment.

Support for gamma and LUT NLT is not necessary.