Output from a flow can now be saved to the flash scope of Spring MVC
when the 'saveOutputToFlashScopeOnRedirect' property of the
FlowHandlerAdapter is 'true'.
For backwards compatibility this is an opt-in feature that must be
configured by the user.
Issues: SWF-1561
* Rework all state handling, removed FlowSerializedView class and save
state as opaque object
* Use FacesWrapper classes instead of custom delegates
* Deprecate isAtLeastJSFXXX() methods and removed all internal use
* Remove all Jsf2XXX versions of classes
* Refactor all calls to deprecated JSF methods
* Removed older VariableResolver and PropertyResolver classes
* Deprecate Jsf2FlowResourceResolver and log warning if used
* Create new FlowELResolver to replace removed VariableResolvers and
PropertyResolvers
* Update faces-config.xml to use newer xsd
* Significantly rework FlowFacesContext to remove the message delegate
and generally improve the code
* Added "provided" dependency to MyFaces and fixed partial state saving
on MyFaces
* Fixed FlowResourceResolver to delegate to both MyFaces or Mojarra
depending on availability
* Add JsfUtils.findFactory method and rework existing code to replace
FactoryFinder calls and casts
* Refactor JsfViewFactory to improve code readability
* Rename FlowViewStateManager and FlowViewResponseStateManager to
FlowStateManager and FlowResponseStateManager
* Ensure ResponseContextHolder is reset after each test
* Update JSF portlet support to function with JSF 2.0
Issue: SWF-1536, SWF-1540, SWF-1550
