This lets us remove 511 duplicate files without affecting the .mcm
files. Note, however, there's a slight change in impact_mini.mcm
because its copy of the boot logo had a few invisible pixels different.
- 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if they're out of date.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.
* Update Vision OSD font by Olivier C with 3D speed symbols
* Update default, bold and large OSD fonts with 3D speed symbols
* Update OSD preview 3D speed with the new symbols
