Check opportunities to simplify integration with Spring

[aaime]

Quoting mail from @aaime :

The other troublesome bit is that the some of the core integration of the dispatcher has overridden some
Spring bits in a deep way to get support for the @HTMLOutput annotations and
the general output format management (e.g., the support of "f=json", or the variable interpretation of
what "f=json" means for example). I don't see it a priority, but you might think otherwise.

Parts of the codebase to consider for potential improvements:

• Manual setup of the Dispatcher
• Custom APIBodyMethodProcessor subclass of RequestResponseBodyMethodProcessor to support the HTMLResponseBody annotation
• Anything else that might streamline our integration and make Spring upgrades less painful.

This week:

• tour of the codebase
• collect feedback and establish if we are comfortable with the approach

[jodygarnett]

Andrea would like feedback/review before this goes live; thinking about long term integration costs as spring updates occur.