Round, Rounded, Correct, Distance(x, y, z, w) and operator< addition to Vector 4

[luccosta]

Resolves #71 .

This implements the functions Round(), Rounded(), Correct(), Distance(T x, T y, T z, T w) and operator overload operator<(Vector4) in Vector4 API.

It enables:

vec4.Round();
Vector4 roundedVector = vec4.Rounded();
vec4.Correct();
vec4.Distance(1, 2, 3, 4);
if (vec4_a < vec4_b) {
  ...
}

[luccosta]

I tried to test the Correct function generating an NaN first with 0/0 but this generate an Exception and them with math::sqrt(-1) that works fine, but generate the following message in code checker:

(warning) Passing value -1 to sqrt() leads to implementation-defined result.

Should I change/remove the test?

[chapulina]

test the Correct function generating an NaN

While working on #139 I noticed that the code checker would complain about 0.0 / 0.0 but not 1.0 / 0.0, maybe this is an option?

Also another option may be to use std::nan().

[luccosta]

but not 1.0 / 0.0, maybe this is an option?

Is a good option, I will check the result.

Also another option may be to use std::nan().

Looks like a more consistent test, I will let with this.

[luccosta]

I will check the result.

With 1/0 I get Floating-point exception running the test as with 0/0.

[mjcarroll]

I don't think that you'll be able to get around the divide-by-zero issue either triggering the code check, compiler warning, or runtime error (since it's a signaling nan).

I agree that using std::nan here is the best approach, since that generates a quiet nan and won't trigger any floating point exceptions.

[luccosta]

I agree that using std::nan here is the best approach

Great, the current PR is using just std::nan.