libkate: Format - font_range

# Format - font_range

A font_range definition consists of:

- a variable length integer representing the first code point spanned by this range.
- a variable length integer representing the last code point spanned by this range.
- a variable length integer representing the index of the first bitmap to map to the first code point.

Next, a warp.

Next, the data ends.

The bitmaps used by ranges are predefined bitmaps, and are used in order from the specified index.