libgimpcolor: add new object GimpColorTransform
which encapsulates a cmsHTRANSFORM and does all the pixel format conversion magic. It has API to create transforms and proofing transforms, and to convert pixels arrays and GeglBuffers. Before, each place which has a transform had to keep around the transform and its input and output Babl formats, and had to implement lots of stuff itself. Now all that lives in GimpColorTransform, removing lots of logic from many places, and pretty much removing lcms from the public API entirely. This removes including <lcms2.h>, LCMS_LIBS and LCMS_CFLAGS from almost all directories and potentially allows to replace lcms by something else.
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