Allow lazy proxies to be a base for tagged features (e.g. scraper chain)

[wackerl91]

• Luna Version: dev
• nVidia GeForce Experience Version: 3.1.2.31
• Moonlight Embedded Version: 2.2.2
• OSMC Version: 2016.04-2

Expected Behaviour:
Declaring a base for tagged features as lazy should return a proxy instance which holds proxy instances of said tagged features

Actual Behaviour:
The tagged features are lost, resulting in all kinds of malfunction

[wackerl91]

The underlying issue that led to the above thought is that the CacheController (responsible for clearing the art / API cache) needs access to the scraper chain. The NvHTTP Scraper is part of that chain, but can't be initialised without the Host Context Service returning a proper value.
As such, there will be more architectural changes needed (implementing the above feature will not fix the underlying issue!)