Updated a few more categories to now be visible to guests. Rationale:
SEO, letting google crawl the maps section is good
maps can link to their forums page, and with visible to guests random players can see those pages without having to be members first. It's generally better to see those pages as guest users rather than 404 or otherwise hide them, which makes things look broken.
I'm still not sure whether to move the AI, Development, and Feature Request sections back to being visible to 'guest' users.