Instead of using a Makefile with multiple arguments that must be
passed via the command line, replace it with a newer version of
max7456tool that allows managing a set of fonts with a single
yaml configuration file.
- When uploading fonts with less than 512 characters, fill the rest
with blank characters to make sure we completely overwrite the
old font. Characters 256-511 are uploaded first, so uploading works
on both chips with just 256 characters and firmware < 2.1.
- Add metadata to the font files, so the flight controller can detect
if they're out of date.
- Add boot logo to all fonts.
