[GUI] Hiergamenon access

These amount to things that reduce clicks (sometimes a lot of clicks) rather than stuff that's not there.

1. I'd like to be able to access the Hiergamenon from the main menu instead of having to load a game.  Yes, I know there are two (Kingdom vs Empire) but that should just require either two buttons or an expanded Hiergamenon with two parts (a meta-title-page, perhaps?)
2. I'd like to be able to search the Hiergamenon for random text; I can't always remember what the name of something is and would like to find it more easily.  It's not a big deal -- paging through the TOC isn't so bad -- but it would still save me some time.
3. It would be nice to have a couple of index pages that would summarize a few things like:
   • Buildings that improve a specific resource -- e.g. food, mining -- with links to the techs that enable them.
   • Resources categorized by function.  Eg.: Food: Fertile Land (Farm: 4 food), Twilight Bees (Apiary: 3 food).  "N food" should use the little cup symbol to save space
   • Viewing the tech tree as a tree, rather than clicking through several pages.
   • A display of all the little icons and what they mean, e.g. cup for food, feather for diplomatic capital.