unicode : avoid char32_t

[ggerganov]

Is there any reason to prefer char32_t over uint32_t? The latter seems more appropriate

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[jaime-m-p]

@ggerganov
I just think char32_t fits better the semantic of codepoint. Also I suggest the other way..
There is not really a reason (I think this is like code-style) so I have no problem.

UTF-32 is a fixed-length encoding, in contrast to all other Unicode transformation formats, which are variable-length encodings.
Each 32-bit value in UTF-32 represents one Unicode code point and is exactly equal to that code point's numerical value.

char32_t - type for UTF-32 character representation, required to be large enough to represent any UTF-32 code unit (32 bits). It has the same size, signedness, and alignment as std::uint_least32_t, but is a distinct type.