Cement SIP header validation

[alexlivekit]

Now that the new validation has been out for a bit, but only as a warning, this is a follow-up.

Behavior changes:

1. Fail on new validation failing, no longer just a warning.
2. Dropped global logs.
3. Validate proper quoting for display name.

Validation changes:

1. Added the '\t' character previously omitted.
2. Allow UTF-8 characters in header values (Spotted one customer with U-8217, or 舗 which apparently means shop).
3. Allow empty headers. These do no harm imo.
4. Fixed validation of 0x7F.

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Latest commit: ea88da0

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[alexlivekit]

Gated behind a boolean check - we want to be able to specify "forbidden" headers in HeadersToAttributes and AttributesToHeaders, but not in Headers.