Function mat4::rotate_y

pub fn rotate_y<'out, T>(
    out: &'out mut [T; 16], 
    a: &[T; 16], 
    angle: &T
) -> &'out mut [T; 16] where
    T: Clone + Float + Add<T, Output = T> + Sub<T, Output = T>,
    &'a T: Mul<&'b T, Output = T>,