* Fixed OE_GUI_MoonShard template;
* Added possibilty to create Source plugins either using
  DataThread or Processor classes in more convenient way
  (as discussed with Josh before);
* Fixed code template for FileSource plugins;
* Fixed minor bug related with TiledButtonGroupManager class;
* Now the plugin's folder is selected by default when creating new
  plugins.
* Some minor refactoring.

* Added feature to create plugins using VisualizerEditors;
* It's possible to manipulate with GUI content both of GenericEditor's
  plugin component and Visualizer canvas (in the tab or window);
* Created file templates for VisualizerEditor and Visualizer (Canvas);
* VisualizerEditor class minor improvements;
* Other minor improvements;
* Refactoring and stylystic fixes.

* Created 3rd slider-page on creating project steps which is used
  to select appropriate plugin, processor type, plugin GUI template,
  other options.
* Created plugin GUI templates system;
* Created some plugin GUI templates for GenericEditor;
* ButtonGroupManager and TiledButtonGroupManager classes minor
  improvements and fixes;
* Changed index of ProcessorType::UtilityProcessor;
* Other minor bugs fixes.