CoreML: Loop support

[Vaida12345]

Hey. Just wondering if you could add the support for bodyNetwork of CoreML. Currently, it is like this:

The layers should be linked together (I have checked this using protobuf), but it is not shown here, as the bodyNetworks are not drawn.
It would be great if you can add support for this! Thank you in advance.

[lutzroeder]

@Vaida12345 can you share a sample file to reproduce this issue.

[Vaida12345]

FrameGRUModel.mlpackage.zip
Sure. Have a look at this package.

[Vaida12345]

Thank you for your implementation in version 7.3.4.
If I may, can I request another feature please?

In this example,

The copy in blue is an input to the loop in green. Can you add an arrow to link these two please, as the one in orange?

Thank you again for accepting my feature request. You can use the same model I sent before.

[lutzroeder]

@Vaida12345 see #1204. Can you help implement this and submit a pull request that works for all formats.

[Vaida12345]

I would love to, but I really don't know how. Javascript is not where I shine. If you give me an outline, I might be able to do that.