Increase visibility of action generator methods

This is to help the resource delegate extension reuse existing code. This may be a good idea to review code generators at some point and increase the visibility of some methods.
Update DispatchRest module DTD to 2.7
Register all generators through multibinder
Simplify code
Blacklist InterceptorMismatchException
Merge pull request #639 from ArcBees/cv_rest_generators_v2_p18

Part 18: Cleanups. Consistency.