For navigation sections, add alternative syntax "show if"

[nonprofittechy]

I've been working with a developer who is making extensive use of the dynamic navigation sections.

It's a very useful feature for him, but the "hidden" option is a regular source of confusion. It should be possible to still keep supporting "hidden" but add a "show if" dictionary key that is alternative syntax.

Thoughts:

• If the dictionary key isn't present, just show the navigation section.
• If the dictionary key is present, evaluate the logic.