Function fixPtrToRune

Source/3rdParty/bx/src/string.cpp:560–565

If offset in UTF-8 string doesn't land on rune, walk back until first byte of rune is reached.

	// If offset in UTF-8 string doesn't land on rune, walk back until first byte of rune is reached.
	static const char* fixPtrToRune(const char* _strBegin, const char* _curr)
	{
		for (; _curr > _strBegin && (*_curr & 0xc0) == 0x80; --_curr);

		return _curr;
	}

	StringView strTail(const StringView _str, uint32_t _num)
	{