Make NetworkTickSmoother show a warning on interpolated Rigidbody

[deogo]

It's been some time before I found that if NetworkTickSmoother has a target containing Rigidbody with Interpolation other than None - this will cause small but annoying jittering unless you have "Detach on Start" option enabled. This is probably because of double interpolation applied - first from NT, then from rigidbody.

Though rigidbody itself show a warning about scripted physics, it still easy to miss.
So i suggest adding a warning to NT itself, something like "Target has Rigidbody with Interpolation enabled. This may cause jittering."