RF-12900: refactored core components to subpackages under ui.core
RF-12900: removed unused ActionListenerHandler and LazyActionListener
RF-12900: removed unused UIActionParameter
RF-12900: refactored ajax components to subpackages under ui.ajax
RF-12900: refactored input components to subpackages under ui.input
RF-12900: refactored iteration components to subpackages under ui.iteration
RF-12900: refactored output components to subpackages under ui.output and ui.toggle
RF-12900: refactored drag components to subpackages under ui.drag