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/qt4projectmanager/profileeditor.h

@@ -57,7 +57,7 @@ public:
 
     bool duplicateSupported() const { return true; }
     Core::IEditor *duplicate(QWidget *parent);
-    const char *kind() const;
+    QString id() const;
     bool isTemporary() const { return false; }
 private:
     QList<int> m_context;