At its only usage point, its return value is stored into a u32, and the
default implementation returns 0xFFFFFFFF (-1), which would be an
unsigned integer. Given all of the bits are used to determine a color,
it makes slightly more sense to treat this as an unsigned value as
opposed to a signed one.
* Use font based sizing for row height. Fits more rows on screen.
* Adds whitespace for better formatting and minimum column width.
Helps prevent frequent resizing while scrolling.
Anthony