Function skeletal_animation::math::dual_quaternion::add

pub fn add<T>(
    a: ((T, [T; 3]), (T, [T; 3])), 
    b: ((T, [T; 3]), (T, [T; 3]))
) -> ((T, [T; 3]), (T, [T; 3])) where
    T: Float, 

Adds two dual-quaternions