Menu options now render in multiple columns

Columns now also scroll horizontally if there are too many to fit
Rearranged some methods

Moved draw_frame above run_frame for both screens.

Moved advance_level inside run_frame for game screen.

Also reverted a testing change in the menu screen, and added some
docstrings.
Added a font class

Should change it to take absolute size values, instead of a scale
multiplier.

Also still have to work it into the menu screen.