Create job-runner project

[donaldgray]

This is preparatory work for paintedResource handling.

Move the CustomerCreatedListenerService : BackgroundWorker from the API project to it's own separate project. This project "job-runner" (name me better) project will hold a couple of listener services, customer-created being the first.

Behaviour should continue to work as-is.

There will be multiple BackgroundWorkers in "job-runner" so have a method to enable/disable based on appSettings.