Set default attributes on relevant inputs

[hartsick]

Prevent autocompletion by browser, autocorrect, autocapitalization, and spellcheck. Belief is that they are not desirable for our main use cases (eg shared computers or data entry for multiple people, phones & names & addresses).

Can be overriden by passing HTML options to form field.

This matches behavior for our previous form builder.

MDN docs: https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/autocapitalize https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/spellcheck https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input#attr-autocorrect (non-standard)

And: https://developer.mozilla.org/en-US/docs/Web/Security/Securing_your_site/Turning_off_form_autocompletion

Closes #263

[hartsick]

@bensheldon great! thanks, ben!