Refactored getImage out of Node class
Refactoring of PluginImagesHelper plus Lang update.
Added node images to GoPluginImages
Added some more images to GoPluginImages.
Refactored some more images into GoPluginImages.
Refactoring of LangImages API
Final refactor of Activator image usage to GoPluginImages.
Cleanup the usage of UI code in some core plugin classes.
Minor cleanup of unused params.