With the binding of configurations to their associated rule types
"unknown configuration" errors can be made more specific mentioning
also the rule's identifier in the printed message.
Advantages of having typical errors at a common place:
* Error message styling can be harmonized
* Existing messages can be reused
* Overview of prefixes ('error: ', 'warning: ')
* Manage how to print them to the console
Danny Mösch
Chris White
JP Simard