Character Handling: PiAware Config

[pgrady]

Wifi network contains a value utf-8 character (e-grave which prints as "è"). With this character entered in /boot/piaware-config.txt, resulting wpa-supplicant.conf is "??" instead of the e-grave character. None of the obvious quote patterns (quoting the string, single backslash, double backslash, unicode (u)) work. Looks like the character handling doesn't support utf-8 (and probably utf-16). Converting the SSID to hex in piaware-config.txt also doesn't work.

[mutability]

SSID character set encoding is, at best, poorly defined. What encoding does wpa-supplicant expect in the config file?

[mutability]

I guess we should detect the "looks like a hex string" case and not quote it, though I am wary of breaking things that look like a hex string but actually are ASCII (C0FFEE..)