Allow public talk submissions

[drnlm]

As requestted by Debconf people, so we don't lose track of it

• Expose all talk submissions, rather than just those accepted
  • Should this be totally public, or just to logged-in users?
  • Just logged in users reduces some of the spam concerns, but may not fit Debconf's requirements.
  • Do we need to restrict publishing by talk type?
• Possibly some sort of talk voting scheme?
  • Build this on top of the KeyValue stuff?

[stefanor]

Possibly some sort of talk voting scheme?

Implemented in #418.

[stefanor]

With some more thought, I think a useful refinement of this is:

There should be some talk types that are inherently public: e.g. BoF, ad-hoc session, open space submission. This can be a flag on the talk type.

There are spam concerns here, because it's making user-provided content public on the site. Events get spammy talk submissions (and user bios). So a useful additional feature here would be a "report content" button on any page with user-defined content. Obviously this can be a follow-up.