[RFC wayland-protocols] Add the color-management protocol

[Graeme Gill]

Niels Ole Salscheider wrote:

Hi,

> The ICC profiles to which the zwp_colorspace objects point can be compared 
> easily: Each ICC profile contains an unique 128 bit fingerprint in the header so 
> that only this fingerprint has to be compared.

actually, this isn't true. The MD5 fingerprint value was only introduced
in ICC V4, and so is not present in ICC V2 profiles. Even in V4
profiles, it is recommended rather than mandatory, so can't be relied upon.

Graeme Gill.