Disable various features by default that might track personal data

[tsteur]

This be probably the only way to ensure users are aware they need to ask for consent to use certain features. To be seen if individual features can be enabled by an admin on a site level or only across sites by super user.

features that should be eg disabled by default

• Events
• Custom dimensions
• Custom variables
• User ID (extra ticket in Disable User ID feature (and possibly other similar features) by default #15432 )
• referrers Offer feature to anonymise or shorten the referrer #15426
• fingerprint Limit visitor fingerprint by default for even better privacy #13655

When enabling a feature, they should be presented with a message saying they need to ask for consent potentially if they track personal data. refs #15478

refs #15435

[mattab]

duplicates #12737 ?

[tsteur]

Kind of. Guess #12737 would need to do this by default instead of having a feature to enable that mode. I suppose we can close this issue for now and see. It be great if there was just not one "super privacy" mode but "super privacy" mode be enabled by default and then individual features could be enabled on demand.