New MapObjects example, with walkthrough text

The map viewer example should be split into two (or maybe more) parts. My suggestion is to split it into a Map Objects example, with drag-and-drop manipulatable map objects and various sections surrounding that; and a Map Navigation example showing how to use geocoding, routing etc.

While it's true there is crossover here in that both parts will make use of map objects, they are showing them in different contexts – one focussed on creating and interacting with them and all their various properties, and one just using them to show the services available from the Location API in geocoding/routing/etc.