WIP add Not Sure to voting options

[compwron]

What github issue is this PR for, if any?

Resolves #745

What does this code do, and why?

How is this code tested?

Are any database migrations required by this change?

Are there any configuration or environment changes needed?

Screenshots please :)

[compwron]

This is an old ruby version and I was not able to install it on my laptop just now, so I can't generate a migration or run it. I made some code notes by hand and I will do more on this later on a different laptop or in a docker container or after making this laptop install the ruby or after upgrading the ruby. I did try locally upgrading to a newer ruby but then I ran into gem issues... I tried upgrading the gems, but then I ran into FFI issues running migrations. So anyway, more later.