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When rotating a vector, rotate_deg does not calculate correctly.

Example:
Vector2 (2, 5).rotated_deg (90) should rotate vector (2, 5) by 90 degrees, which should return a vector (-5, 2) (correct example result).

It instead returns a vector (2, -5).

Using the latest version, you can reproduce it with this code:

std::cout << Vector2f (2, 5).rotated_deg (90) << std::endl;

Which will output x: 2 y: -5, a wrong result.

This is reproducible with many different vectors and degrees.