This is needed because `require()` means something different in webpack - it ends up importing the module as something we didn't expect (and is occasionally async)
We use `export default` begrudgingly here. Ideally we'd use just `export`, though this entire SDK expects things to be exported as a default. Instead of breaking everything, we'll sacrifice our export pattern for a smaller diff - a later commit can always do the default export -> regular export conversion.
the js-sdk is making some of its APIs asynchronous, and adding an `initCrypto`
method which you have to call.
Particular methods we need to worry about are:
* `getStoredDevice`
* `getStoredDevicesForUser`
* `getEventSenderDeviceInfo`
* `isEventSenderVerified`
Add Modal.createDialogAsync, which can be used to display asynchronously-loaded
React components. Also make EncryptedEventDialog use it as a handy
demonstration.
