Add possibility to enter username in app and store it

[SpaceOgre]

It would be a big improvement to be able to enter your username from the app one time and for it to fetch the Id and store that for future use.

I know it can be done just need to look up how to store it.

[henriquelbsouza]

Do you know how to test it locally? Without installing it on TV?

[SpaceOgre]

Do you know how to test it locally? Without installing it on TV?

Samsung have some kind of emulator I think but I have never tested it.

[SpaceOgre]

Started to add a bit of better support for userid/username. Will push a new release if the Client-ID fix works.

I will not be able to test on the TV with a prompt in the APP so all I have done now is to add support via the config.js