AV1515: Include binary literals and digit separators

[bkoelman]

Rule title: Don't use "magic" numbers (AV1515)

Binary literals example:

byte b1 = 0b00001111;

Digit separators example:

private const int OneGigabyte = 1_073_741_824;

[bkoelman]

For this rule, I propose to update the first example to show usage of these new features.

public class Whatever  
{
    public static readonly Color PapayaWhip = new Color(0xFFEFD5);
    public const int MaxNumberOfWheels = 18;  
    public const byte ReadCreateOverwriteMask = 0b0010_1100;
}

Other than that, I don't think changes to this rule make any sense.