IAB GPP and TCF as source for cookie categories

[dmarti]

IAB TCF has a list of vendors and purposes -- this would be an up to date source for section 4: https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/IAB%20Tech%20Lab%20-%20Consent%20string%20and%20vendor%20list%20formats%20v2.md

Whatever the approach here it would probably be good to link to relevant sections of IAB GPP and related documents so that the relationship between in-browser settings and CMP settings is clear. https://iabtechlab.com/gpp/