[feature] Allow to drill down to indoor map (floor plan) from map

[pandafy]

Implement functionality to support indoor locations within the mapping interface. When zooming in on a device located indoors, users should see an option to switch to the indoor view. This view would show the floorplan of the indoor location. The indoor maps view should take care of the following possibilities:

• An indoor location can have multiple floors. The view should be allow users to navigate between different floors.
• There can be multiple devices on the same floor. The view should show all the devices on a floor.

[pandafy]

Open for discussion:

I have created a rough mock-ups to show how imagine this feature to work. However, these should only serve as starting point since they lack attention to detail.