Commits on Feb 17, 2020

1. Add a PDFViewerApplication.initializedPromise property to allow (ea… …

   …sier) tracking of when the default viewer has been initialized
   
   This complements the existing `PDFViewerApplication.initialized` boolean property, and may be helpful for custom implementations of the default viewer. This will thus provide users of the default viewer an alternative to setting the preference to dispatch events to the DOM (and listen for the "localized" event), since they can instead use:
   ```javascript
   document.addEventListener("webviewerloaded", function() {
     PDFViewerApplication.initializedPromise.then(function() {
       // The viewer has now been initialized.
     })
   });
   ```
   
   Note that in order to avoid manually tracking the initialization state *twice*, this implementation purposely uses the `PromiseCapability` functionality to handle both `PDFViewerApplication.initialized` and `PDFViewerApplication.initializedPromise` internally.

   

   Snuffleupagus committed Feb 17, 2020
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