Register module in homebridge as platform

[afharo]

Since the introduction of zones and room support, it makes sense the tiles to be moved across rooms in the Home app (#246).

In order to do that, the module should be registered as a platform instead of an accessory.

Let's use this issue to track the progress of doing that conversion.

[adamrzanek]

It would be so great!

[afharo]

Here's the example for us to follow: https://github.com/homebridge/homebridge-examples/tree/master/dynamic-platform-example-typescript