maketx built with OCIO support requires config

[antirotor]

Bug

maketx tool as a part of the OpenImageIO frameworks needs OCIO config when OIIO is build with OCIO support. It doesn't know even the simplest color profiles. This makes look workflow broken in Maya if OCIO isn't enabled.

Suggested quick fix:

• Add OpenColorIO-Configs to /vendor as git submodule
• Add argument to maketx in Extract Look to add nuke-default as its OCIO config

More robust solution:

Implement proper color management in OpenPype :)

from maketx help

Color Management Options (OpenColorIO enabled)
    --colorconfig FILENAME   Explicitly specify an OCIO configuration file
    --colorconvert IN OUT    Apply a color space conversion to the image. If the output color space is not the same
                               bit depth as input color space, it is your responsibility to set the data format to
                               the proper bit depth using the -d option.  (choices: NONE)
    --unpremult              Unpremultiply before color conversion, then premultiply after the color conversion.
                               You'll probably want to use this flag if your image contains an alpha channel.

[cuID:OP-3657]