Support setting the initial study/series/image to load and view via querystring parameters (route).

**Why?**

A common integration point for our viewer is as follows:

3rd party application is not capable of displaying DICOM images, but has thumbnails of images the end user may find interesting.

When a thumbnail is selected, the 3rd party application launches the OHIF Viewer. Ideally, with the initial study/series/image loaded/viewable as the tapped thumbnail.