Proposal for public-facing APIs to implement Content Security Policy.

[garydgregory]

The commit is only for new APIs before I dig into an implementation.

Before I proceed I'd like to get feedback on how this looks to the Juneau developers.

[jamesbognar]

@garydgregory - Are you still interested in implementing this? I'm close to doing a preview release for 9.0. It would be good to get this into 9.0.0.

Note that there have been changes to the way serializers are configured (no more properties like HTMLDOC_xxx and instead just builders now). So unfortunately it's not a clean merge to get your current changes into the code.

[garydgregory]

Hi @jamesbognar
In theory yes, but in practice I have my FOSS time pretty occupied ATM with Apache Commons, so I have to back away for now. I should be available for testing an RC to see if we have any compatibility issues with our product though.

[jamesbognar]

Sounds good. If you want, I can sort out the conflicts and merge the existing changes. Otherwise I'll just leave this PR open for now?

[garydgregory]

@jamesbognar Feel free to merge or do as you best see fit. I apologize for not taking the time to dive back in ATM.