Add a detailed Trip Plan page.

[pingzing]

Should display an Itinerary in a more expanded, vertical manner. Should show all stops, including intermediaries. Maybe fare price too?

Current design TODO:

• [x] Add click-interaction on the list view to zoom map to that point
• [x] Rework the list view slightly to use an ItemTemplateSelector to handle the special case of the final point--technically it's not a point of its own, but rather the To field of the final Leg. We want to display it as its own ListViewItem. We can check the IsEnd property to determine the appropriate template.
• [x] Make the map automatically frame the route in the visible space when we switch to the detailed view.
• [x] Color-code route drawing on the map by transit type
• [x] Add a "you are here" indicator on the map

[pingzing]

Update: New design features a map behind the underlying route.