Router - Routing to iframe-less versions with expiring session cookie

[huntharo]

Motivations

• iframe-less apps use ?appver=0.0.0 to route to a specific version on page load
• Unfortunately, on subsequent navigation (full window.location change) the appver is lost
• We should set a session cookie that expires after, say, no 15-60 minutes, that contains the app version (under the prefix but not the app name since the app can be started without a trailing / and two apps can have overlapping names)

To-Do

• Set cookie when query string is present
• Clear cookie when query string is present with no value
• Add unit tests