Support Concerto 2

[augustf]

It's probably high time we drop Concerto 1 support and support Concerto 2 URL's and screen auth. It wouldn't hurt to build and test this for a wide variety of Android devices as well, since people are just as likely to use this on a connected tablet as anything else.

[kench]

Concerto 2 Frontend API Reference:

https://github.com/concerto/concerto/wiki/Concerto-Frontend
https://github.com/concerto/concerto/wiki/Authentication

For the first link, can someone disambiguate the definition of host here? I've tested the Bandshell authentication workflow manually and it works, is that what needs to be implemented in V2?

Also, is Bandshell authentication and the frontend configuration the same thing or different code paths to authenticating screens? Some initial reading suggests they are two different beasts.

I made an initial commit with the configuration settings that need to be persisted on the Android Player app in case someone wanted to build a preconfigured image with all the necessary bits preconfigured. Please check that my assumptions are correct.