feat: add support for CMYK color mode

[quarksb]

attach psd file for test Archive.zip

[quarksb]

I am not sure whether the cmyk convert code is correct, but it seems work ok, but I believe we should test it in detail be merge it

[Agamnentzar]

The changed algorithm seems to give the same result.

Export from photoshop:

Old algorithm:

New algorithm:

[Agamnentzar]

The file is from here: https://github.com/Agamnentzar/ag-psd/tree/master/test/read/cmyk

[quarksb]

yeah, there algorithm is same to before, and I have change it back. As for the color difference，According to my friend，we need convert the color by icc file.