Better logic to set webpack public path in AMD modules #3508
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Fix for #3474.
This uses the technique from jupyter-widgets/widget-cookiecutter#103 to get the public path for amd modules and creates an example that uses the amd modules built for html-manager.
This is another take on #3464, since that approach did not work to set the public path in AMD modules. Essentially, since AMD modules are executed asynchronously, the webpack 'auto' public path logic does not work. Instead, we use the requirejs-specific 'module' magic dependency, which allows us to get the path to the current AMD module, and use that to get the public path. We do this public path computation in a separate script to isolate it from any library code.