Improve UTF-8 support #267
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MOROS started with only ASCII but it supports AZERTY keyboards that have accented keys that break the assumption that a character in a string takes only one byte. This PR change the console IO, the prompt, and the editor to work on character vectors (equivalent to UTF-32) instead of strings (UTF-8).
It is good enough for Latin languages but more work is needed to fully support UTF-8. We'll also need to read the unicode table at the end of PCF fonts and improve rendering.