midicontrols
                                
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                        [WIP] update to modern JupyterLab
I don't really know what I'm doing. But this is some amount of the way there.
I'd appreciate guidance (cc: @jasongrout @wolfv @martinRenou)
I took the output of the widget cookiecutter and patched in the logic from the old version.
I ran into one type mismatch (using unpack_models) which I handled with a kludge, but I imagine I have a version mismatch somewhere?
This is what I get right now:
 
                                    
                                    
                                    
                                
This PR may fix it https://github.com/ipython/ipykernel/pull/1097 ?