Unicode support?

[bmcorser]

Looking at @floooh's browser demo https://floooh.github.io/sokol-html5/wasm/sgl-microui-sapp.html, when I type eg. the § character into the input for the log window and click the submit button, what looks like a deformed copy of the sprite sheet for the font appears.

Not sure if this is just because the demo isn't written to support unicode, or a bug? Feel free to close this issue if the former is the case.

[rxi]

Though the library is written to support unicode, the demo itself is meant only as the most minimal implementation of rendering as to provide a basic demonstration of the library itself. The demo code shouldn't typically be used anywhere else. That being said I should probably change the demo rendering code to, at the very least, ignore characters outside the 0-127 range.

[rxi]

Changed the demo's renderer to use a unicode replacement glyph for unicode characters: 808b46f