auto p1 = Fixed!4("1.1");
assert(p1.value == 11_000);
auto p2 = Fixed!4("1.");
assert(p2.value == 10_000);
auto p3 = Fixed!4("0");
assert(p3.value == 0);
auto p4 = Fixed!4("");
assert(p4.value == 0);
auto p5 = Fixed!3("1.2345", true);
assert(p5.value == 1235);
Create a new Fixed struct given a string. If round is true, then the number is rounded to the nearest signficiant digit.