* Backported major changes from Fluid v5 to Fluid v4
* !!! Many of these changes are not backwards-compatible! Please read this if you have written custom ViewHelpers!
* Introduced Shorthand Syntax for calling ViewHelpers
* Core:
** Lots of internal cleanup and refactorings.
** !!! Complete restructuring into subpackages.
* ViewHelpers:
** !!! The base classes of ViewHelpers changed to Tx_Fluid_Core_ViewHelper_AbstractViewHelper and Tx_Fluid_Core_ViewHelper_TagBasedViewHelper. Please adjust your ViewHelpers!
** !!! $this->variableContainer has been renamed to $this->templateVariableContainer
** !!! the view is not in $this->variableContainer anymore. Currently there is no way to fetch the View from a ViewHelper.
** Introduced a new $this->controllerContext containing the context variables of the controller
** !!! The request can be now found in $this->controllerContext->getRequest()
** !!! The URIHelper has been renamed to URIBuilder and can be now found in $this->controllerContext->getURIBuilder()
** Introduced a new ViewHelperVariableContainer, available in $this->viewHelperVariableContainer to pass data between ViewHelpers. Should only be needed in very rare cases.
** !!! Removed <f:format.htmlEscape> ViewHelper! Please remove these declarations in your template! Escaping of object accessors is now automatically done, see next point.
* !!! ObjectAccessors {...} are now automatically HTMLspecialChar'd if not used as an argument to a ViewHelper. This is done using a new ObjectAccessorPostProcessor. Lateron, this will be made configurable.