Make it possible to configure the API domain and Application ID

[betterphp]

Is your feature request related to a problem? Please describe.
My energy provider uses an app called SmarterLiving which is made by the same company as the Bright app. They also don't provide the information necessary to sign up for the Bright app. I've reverse engineered the app and the API requests that it makes are compatible with the ones used by this project.

Describe the solution you'd like
Add a config option for the application ID to use and the domain for the API. Essentially I need to use "api.manxutilities.im" instead of "api.glowmarkt.com" and the application ID from the SmarterLiving app instead of the Bright one.

Describe alternatives you've considered
I can add a /etc/hosts file entry to bodge the API domain but the application ID is still wrong.

Additional context
Just to show that the API does look to be the same...