Request: emit deprecation warning for getArgument, hasArgument, getArgumentNames, getPath methods.
Request class refactor.
ListComposite, CompositeController, PluggableAction, PluginController, Menu (bind): deprecated spawnRequest() $path argument
RequestInterface: new getFormat() and getLanguageCode() methods. Refs #2113
Main UI controller: removed "system modules"
Login UI module: use "path" paramter and Language UI module for redirects. Refs #2113
RequestInterface: Fixed @deprecated annotations. Refs #2113