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/qmlinspector/qmlinspectormode.cpp

@@ -160,9 +160,9 @@ QmlInspectorMode::QmlInspectorMode(QObject *parent)
 
     setWidget(createModeWindow());
 
-    setName(tr("QML Inspect"));
+    setDisplayName(tr("QML Inspect"));
     setIcon(QIcon(":/qmlinspector/images/logo.png"));
-    setUniqueModeName("QML_INSPECT_MODE");
+    setId(QLatin1String("QML_INSPECT_MODE"));
 }
 
 void QmlInspectorMode::connectToViewer()