Fixed.opBinaryRight

auto p1 = Fixed!4(1);
auto p2 = Fixed!4(2);
assert(p1 + 1 == 2);
assert(p1 + p2 == 3);
assert(p1 * 2 == 2);
assert(cast(double)(p1 / 2) == 0.5);
auto p3 = Fixed!2(2);
auto p4 = p2 + p3.to!(Fixed!4);
assert(p4 == 4);