Add colors helper #7
Add rec709 definition #7
rgb_to_xyz initial commit #7
Update README #7
Add AlexaLogCV3 colorspace #8
PlotThatLut : display several curves

For now only available in command line and for curves (not for cubes)
Factorize 3d values process #9
Add 3d json export #9

In lut_utils and lut_to_lut
Add missing documentation
Add private colorspaces feature
Reformat matrices display
Add simple gamma function
Add WideGamut colorspace
Refactor Rec709 Colorspace

To prepare Rec2020 addition
Add Rec2020 Colorspace
Sort colorspace list
Add ACES Colorspace
Add sRGB colorspace

Now Rec709 is a child of sRGB.
Inverted matrices (XYZ to RGB)
Merge branch 'develop'