Decimal string to floating point conversion with correct half-to-even rounding

[Walter Bright]

On 6/21/2020 8:24 AM, 9il wrote:
> So excited to finally announce we can correctly parse floating-point numbers 
> according to IEEE round half-to-even (bankers) rule like in C/C++, Rust, and 
> others.

Great work! Would you like to add it to dmd?