Config files (the default one in ~/.workload_automation plus ones specified with -c) can now be written using YAML syntax as well as Python.
Also, updating help messages for exising arguments to use multiline strings.
- standardisded on a single context argument - removed Device.init() no longer necessary as initilize now automatically gets propagated up the hierarchy. Renamed the existing use of it to "initilize". - related pylint cleanup.
