private void Start()
{
instance = this;
}
/// <summary>
/// Here when the player changes the default variant for a part.
/// </summary>
/// <param name="part"></param>
/// <param name="variant"></param>
private void OnEditorDefaultVariantChanged(AvailablePart part, PartVariant variant)
{
VariantPersistScenario.SelectDefaultVariant(part);
}