5x8 Font: Add most Latin-1 characters

Now most Latin-1 characters have a representation in the 5x8 font:

@fcambus Is this something you would consider for merge or rather not?

@fcambus Sorry for bumping this again, but once per quarter is hopefully not too high-frequency, maybe it just got buried in other notifications :) Is this something that can be merged, or does it need more work or would you rather not merge it? Thanks!

Sorry for the delay, I only recently resumed work on Spleen after a long break.

Due to character size constraints, it is not possible to fit the glyphs from the Latin-1 Supplement Unicode block in a way which would be readable and respect the consistency of the other sizes, that's why they have been left out. I have tried in the past :)

Yes, the upper case characters with diacritics are sized a bit smaller (vertically) than their non-diacritic versions (see the screenshot for all the characters in this PR).

If it's not a good fit for submitting upstream, I can also just maintain this for myself downstream.

Out of curiosity, what is your use case for this?

I'm honestly not sure what the use case would be. The 5x8 variant was created for small OLED displays, typically for appliances control panels, which do not really need anything more than ASCII.

Out of curiosity, what is your use case for this?

Retro DOS/pixelart games, with German and French localizations. Which I agree is quite niche :)

Example usage:

And with umlauts/latin1 characters:

Another screenshot showing latin-1 characters used in the French localization: