Conversion from CubicHermite to Bezier is wrong

[MFridlyand]

Following snippet demontsrates the issue
TEST_CASE("Hermite to Bezier")
{
Magnum::Vector2 t1(0.1f, 0.3f);
Magnum::Vector2 p1(1.0f, 1.0f);
Magnum::Vector2 t2(0.5f, 0.5f);
Magnum::Vector2 p2(2.0f, 7.0f);
Magnum::CubicHermite2D a(t1, p1, t1);
Magnum::CubicHermite2D b(t2, p2, t2);
using CubicBezier2 = Magnum::Math::CubicBezier<2, Magnum::Float>;
auto bezier = CubicBezier2::fromCubicHermite(a, b);
std::vector params = { 0.0f, 0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.7f, 0.8f, 0.9f, 1.0f };
for (auto t : params)
{
Magnum::Vector2 hermite_value = Magnum::Math::splerp(a, b, t);
Magnum::Vector2 bezier_value = bezier.value(t);
if (fabs(hermite_value.x() - bezier_value.x()) > 0.1f || fabs(hermite_value.y() - bezier_value.y()) > 0.1f)
CHECK(false); // t = 0.1 hermite = [1.03, 1.18] bezier = [0.55, 0.70]
}
}

Also fromCubicHermite is not enabled for CubicHermite1D