- Before it wasn't actually loading the intro graph because assetPath not set
- The test for Three Rivers City Hall was using the wrong nodeid
- All these test errors were being ignored because of the use of .finally(done)
- To actually make an error happen, we can call `done(err)` with the Error
Consolidate localization behavior and init to a coreLocalizer function and singleton
Explicitly support `en-US` locale
Rename coreData to coreFileFetcher and export a singleton rather than using a property of coreContext
Add `apiConnections` property of coreContext to simplify adding a source switcher
Replace some init functions with re-callable, promise-supporting `ensureLoaded` functions
Make coreContext itself load the UI if a container has been specified at init time
Fix code tests
