[Feature Request] Display skip layers better

[justinchuby]

In netron, it is clear when there is a skip connection across layers, but the same information is lost in model explorer because the connections are not rendered across layers.

[justinchuby]

Clear when it is flatten:

[pkgoogle]

@justinchuby, This seems like a reasonable request, as it affects "visualization correctness" at the higher level. We will take a look.