Function reverse

3rdparty/bx/src/dtoa.cpp:463–469

	}

	static void reverse(char* _dst, int32_t _len)
	{
		for (int32_t ii = 0, jj = _len - 1; ii < jj; ++ii, --jj)
		{
			swap(_dst[ii], _dst[jj]);
		}
	}

	template<typename Ty>
	int32_t toStringSigned(char* _dst, int32_t _max, Ty _value, uint32_t _base, char _separator)