Refactor: ActionServletWrapper now properly supports modular configuration of Struts

  * Removed message.properties, Struts is now configured using renderers.json
  * For renderers.json reference, see the ActionServletConfiguration class
  * Also refactored RenderersRequestProcessors to allow different RequestProcessors
    per Struts module
  * Fixed ConfigurationReader to once again work on Tomcat
Instead of extending RequestRewriterFilter, one can now dynamically register rewriters
AutoCompleteProvider is now parameterized on the return type
ExceptionHandlers now actually receive the exception to be handled
Minor Change: Add the provider to the AutoComplete input renderer
I18N filter now gets its values from I18N
WebFragment changed so that filters run after bennu-core's
Remove wrong renderers declaration