Add Quatf::setRPY(f32, f32, f32) helper function

[malleoz]

Add a setRPY function which takes in floats instead of a vector. This is useful when we end up constructing temporary Vector3f objects solely so that we can call into setRPY. Audit all existing uses of setRPY to eliminate temporary construction of vectors.

[malleoz]

/// @brief Helper function to avoid unnecessary Vector3f construction.
void Quatf::setRPY(f32 r, f32 p, f32 y) {
    const f32 cy = Mathf::cos(y * 0.5f);
    const f32 cp = Mathf::cos(p * 0.5f);
    const f32 cr = Mathf::cos(r * 0.5f);
    const f32 sy = Mathf::sin(y * 0.5f);
    const f32 sp = Mathf::sin(p * 0.5f);
    const f32 sr = Mathf::sin(r * 0.5f);

    w = cy * cp * cr + sy * sp * sr;
    v.x = cy * cp * sr - sy * sp * cr;
    v.y = cy * sp * cr + sy * cp * sr;
    v.z = sy * cp * cr - cy * sp * sr;
}

[vabold]

One defaults to the other in EGG. I'm not sure which is which.

Vectors should decay into floats in this case.