Support late binding of other simulators about cassim HOT 3 CLOSED

Have in state a dict of which simulators are loaded. In the late bound import promise resolver set that that simulator name is loaded which allows the selector to go ahead and expand it in other selectors like selectCurrentSimulator. The main class should have a .renderer constructor that can be used as the entry point for the renderer (make sure it doesn't constantly recreate the object, which would losing data bind state)

Frame visualizer should pass itself to the renderer constructor. And renderer constructor (in base class) should have a weak map of frame visualizer to instance of its renderer (that will allow multiple renderers of the same simulator without thrashing)

Since we'll be loading variable named imports we'll need to programmatically generate the polymer.json with extra entry points, since the auto generation I think relies on static analysis of import statements (likely in the same gulp tasks as the one to enumerate the JSON directories to show a loading affordances for)

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Will also need a gulp build-listings that enumerates all valid simulationNames at build time, so they can be shown in the dropdown UI. Similar to the need for enumerating all of the valid data.json files in the data directory for that drop down

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• Make it so name is provided by the class
• Make it so renderer is on class
• Make it so frame-vizualizer is passed the simulation object and figures out which renderer to use base don that
• Do the memoizedRenderer method
• Actually use the renderer to render in frame-visualizer
• Keep track of imported simulators
• Stop doing a manual import for all simulators, only load up the ones on demand. (verify bundling works)
• Document that you have to add a renderer to polymer.json
• The bug is that the es6 bundled fragment doesn't export a default module, but rather $schellingOrg, $schellingOrgDefault
• A gulp deploy that builds and firebase deploys
• A gulp generate-config that does all static config generation
• updateCurrentSimulationOptions also needs to rerun the 'load required imports'
• A gulp build that does the generate polymer-json and then a polymer-bulid
• There's a race condition where slow-loading simulators lead to weird URLs that get things wedged (e.g. a number)
• Have the polymer.json be updated automatically to add extra entrypoints for all entrypoints in simulators directory
• Also generate a src/LISTING.json that has the simulator names in it
• Polymer.json also includes listings.json
• Have the drop down in simulator names based on the autogenerated simulators names based on loading src/LISTING.json

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