Edit a string of text NB: when active, hold on a privately held copy of the text (and apply back to 'buf'). So changing 'buf' while active has no effect. FIXME: Rather messy function partly because we are doing UTF8 > u16 > UTF8 conversions on the go to more easily handle stb_textedit calls. Ideally we should stay in UTF-8 all the time. See https://github.com/nothings/stb/issues/188
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