Upon initilisation WA3 will now also check if a WA3 config file
exisits, rather than just the exsistance of the config directory.
If a `config.yaml` file is not found WA will look for a WA2 config.py
file and convert it to the new format, otherwise a default config file
will be generated.
Changing the way target descriptions work from a static mapping to
something that is dynamically generated and is extensible via plugins.
Also moving core target implementation stuff under "framework".
