Create a real settings menu

[Knifa]

The settings menu still need put together! I propose basically the same as what we had before but needs put together in a nice way.

I want to be able to do things like:

• Toggle beeper on and off
• Toggle auto-saving
• Run calibration
• Change screensaver timeout
• Specify startup mode

Ideally something would be put together that lets us handle the various inputs for each menu item in their own little based, maybe event based like before. Making something re-usable for the side menus and main menu would be great.

In terms of items we only need:

• Toggle items (straight forward)
• Numerical items (also need an associated minimum and maximum value?)

In terms of the menu itself it needs to:

• Show the items, obviously.
• Allow scrolling for when the list is longer than the screen.
• Be able to exit/save.