* Refactor Alexa Smart Home API
Having an object per interface will make it easier to support
properties.
Ideally, properties are reported in context in all responses. However
current implementation reports them only in response to a ReportState
request. This seems to work sufficiently. As long as the device is
opened in the Alexa app, Amazon will poll the device state every few
seconds with a ReportState request.
* Report properties for some Alexa interfaces
Fixes (mostly) #11874.
Other interfaces will need properties implemented as well.
Implementing properties for just PowerController seems sufficient to
eliminate the "There was a problem." error for any device that supports
it, even if other interfaces are supported. Of course the additional
properties will be reported incorrectly in the Alexa app.
Includes a minor bugfix: `reportable` was previously placed incorrectly
in the responses, so Amazon was ignoring it.
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