Make map zoom and center configurable via URL parameters

[barbeau]

Summary:

We're looking at using the USF Maps App on TVs in display lobbies. As part of these installations, we'd need URL parameters that can define the map zoom level and center for looking at the Layers, in particular the USF Bull Runner.

This may need to override the real-time position centering code, and possibly hide the real-time position as well - this may need to be it's own parameter, as hard-wired machines at USF have issues with accurate gelocation. Maybe we add a "You are here" pin instead?

[barbeau]

From @liquidsunshine, regarding priority of some of these related issues for using the app to show information in the CUTR lobby on a TV display:

Here’s how I would prioritize them, based on CUTR’s needs:

1. Route polylines don't show when visiting direct link to route layers #401 (a bug)
2. Make map zoom and center configurable via URL parameters #403 (allows us to automatically center on CUTR)
3. Add URL parameter to turn off "Don't use while driving" #404 (allows us to automatically bypass popup)
4. See if we can support an additional map zoom level #405 (offers a better view of CUTR)
5. Make client-side refresh rate configurable via URL parameter #402 (possibly improves refresh performance)