Validation errors and hints when parsing project configuration

[stuartc]

We would like some helpful error messages when parsing/coercing project configuration.

• Check that a CriteriaTrigger is formatted correctly
• Ensure jobs link to existing triggers
• Ensure there is at least something in the expression for a job

[stuartc]

ensure the adaptor field is set on a job.

In addition AdaptorService should get the adaptor names from the Config struct instead of reading the config directly to avoid future changes not being made in both places.