develop a standard interface for simple menus

[ahicks92]

In the f2.0-dev branch we can see research.lua, which has a number of menu_xxx functions. This then goes out of the way to reimplement things like menu search. In general we have lots of menus that are simple one-offs, possibly but not always over a simple dynamic list. This is true even of the inventory, which is a 1d menu masquerading as a 2d one.

We will be introducing layers. Once that's done, we will have a powerful mechanism for redirecting input and building UI abstractions. But powerful doesn't mean simple. What a lot of code wants is up/down/left/right/a few variations on click. If we then add some functions (I think around 3) to allow search to iterate in a relevant order, we can standardize all our menu code. While one would for now still be writing their own position movement code, that's fine: it's still an improvement, and an improvement we can build better things on top of such as completely static menus that call specific functions with specific labels.