Control Info Bar

Taking a page out of EmulationStation's new theme, let's add some helpful info on how to control Kart. I :heart: EmulationStation, and they're doing a lot of things right with their new theme.

## What is it?

This adds a bar at the bottom of the UI that shows how to control Kart. This helps people that aren't familiar with the setup, learn how to use it right away. This is especially helpful for friends using it for the first time, or unfamiliar members of a household.

## Anything else?

Yeah, this also changes the default font from `Arial` to `Helvetica Light`. This probably should have been done on its own pull, but oh well. Yolo.

## What does it look like?

![animated-2014-08-26_23h-16m-43s](https://cloud.githubusercontent.com/assets/260/4054944/24c8e94a-2d99-11e4-84e0-ea09c6f19d98.gif)