Required subscription validation

[Spexxel]

There are several new issues about failing to start a stream where some of them the issue was not having an active F1TV subscription. #333 and #363
In order to add to the user-experience I have made a simple validation and errormessage for this case.

Functionality changes:
When users try to watch content without a valid F1TV subscription an user-friendly error will be shown along with the minimum subscription level needed for that content (Access/Pro).

Code Changes:

• Added the minimum subscriptionlevel needed for F1TV resources to the IPlayableContent and its implementations. This field comes from the F1TV api response field 'Entitlement'.
• Added a simple validation on SubscriptionStatus at the start of the watch and download-actions.

Sadly we do not know the type of subscription the user has since F1TV does not return that upon authorizing.(Maybe there is a different way, but didnt check as I went for a simple validation)

[crescog]

From today race control does not recognize my access credentials. the message says: request failed except status code forbideen.
What I can do.
my email is: crisesco50@hotmail.com

[imnotnoa]

From today race control does not recognize my access credentials. the message says: request failed except status code forbideen. What I can do. my email is: crisesco50@hotmail.com

This is already being addressed: #414

Also, pull request comment threads are not the way to submit issues.