Support SameSite cookie attribute. #1217
Draft
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Needs careful testing.
Also, we probably don't want to set the attribute if the user hasn't asked us to; at present the code will set it to 'None' - which, while
that's what a standards-compliant browser will interpret the lack of a SameSite attribute as, it's probably still better to only send it if we were told to, and omit it if not?