Trigger system added to DragOn and BarOn.

Add: trigger 'DragOn.toggle' - disable/enable DragOn with Plug-ins;
Add: trigger 'DragOn.remove' - destroy object DragOn;
Add: trigger 'BarOn.toggle' - disable/enable BarOn plug-in;
Add: trigger 'BarOn.remove' - destroy object BarOn.