Reduce coupling between ValueEditors/Viewers and Set and StyleSheet.

- Adding of actions is done with an addAction function
 - Files are read from
     - getStylePackage for styling stuff (this is stylesheet)
     - getLocalPackage for symbol and image values (this was the set)


git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@970 0fc631ac-6414-0410-93d0-97cfa31319b6

src/gui/value/choice.hpp

@@ -36,7 +36,6 @@ class ChoiceValueEditor : public ChoiceValueViewer, public ValueEditor {
   private:
 	DropDownListP drop_down;
 	friend class DropDownChoiceList;
-	friend class ChoiceThumbnailRequest;
 	/// Change the choice
 	void change(const Defaultable<String>& c);
 };