* Changed the order of plugin types at the enum definition.
* Changed some plugin definition names to be more user friendly and to
  be consistent with OE GUI.
* Removed "DataThread" plugin type from the "Plugin type" comboBox at
  the plugin creation page. Now to create DataThread plugin user
  should select "Processor" plugin type, then "Source" processor type
  and click "Use separate thread" button
* Removed possibility to create "Utility" processors plugins since we
  don't want to let users create such types of plugins.
* Removed possibility to generate editor and content component files
  for non-processor plugins since this feature was redundant.
* Removed "Plugin" page from "Config" for non-processor plugins since
  they have no built-in parameters.
* Added missing LookAndFeel related files to stage.
* Refactoring.