Changes to properties such as CanPlay, CanPause are not notified

[markdryan]

Notifications should be generated for each of these properties when the PlaybackStatus changes, but they are not.

[jku]

So I'm assuming this means the case when CurrentTransportActions is not supported by the DMR? We could make educated guesses on the property values based on the status...
I'm not sure if we can do that though: the spec sometimes only states where an action is allowed: for several actions (e.g. Seek) it says "In other states the action MAY also succeed or it MAY fail with error code 701"