Make method naming more consistent.

* Use id() for methods returning a string used to represent
    some type of object.
  * Use displayName() for strings that are meant to be user
    visible.
  * Quieten some warnings while touching the files anyway.
  * Move Factories to their products in the plugins where that
    was not done before.

Reviewed-by: dt

src/plugins/vcsbase/basevcseditorfactory.h

@@ -53,7 +53,9 @@ public:
     virtual QStringList mimeTypes() const;
     // IEditorFactory
 
-    virtual QString kind() const;
+    virtual QString id() const;
+    virtual QString displayName() const;
+
     virtual Core::IFile *open(const QString &fileName);
     virtual Core::IEditor *createEditor(QWidget *parent);