//Between does not include being parallel to either vectors - the value returned will be zer0
public static bool IsBetweenVectors(this Vector2D candidate, Vector2D vFrom, Vector2D vTo)
{
var candidateDia = candidate.DiamondAngle();
var fromDia = vFrom.DiamondAngle();
var toDia = vTo.DiamondAngle();
return((fromDia < toDia)
? (candidateDia > fromDia && candidateDia < toDia)
: (candidateDia > fromDia || candidateDia < toDia));
}