Design mode: Give IEditor a 'preferred mode'.

... and switch to it in EditorManager::activateEditor.
There no longer is a need for special currentEditorChanged()
handling in the editor that use a special mode.

QmlDesigner receives an additional setting specifying the
desired edit mode. QmlJSEditor detects whether QmlDesigner
is present by checking the registered mimetypes of the
Design mode and retrieves the settings via keys.

Remove some obsolete code and clean up includes
on qmldesignerconstants.h

Reviewed-by: con

src/plugins/coreplugin/designmode.cpp

@@ -127,6 +127,14 @@ QString DesignMode::id() const
     return QLatin1String(Constants::MODE_DESIGN);
 }
 
+QStringList DesignMode::registeredMimeTypes() const
+{
+    QStringList rc;
+    foreach(const DesignEditorInfo *i, m_editors)
+        rc += i->mimeTypes;
+    return rc;
+}
+
 void DesignMode::registerDesignWidget(QWidget *widget, const QStringList &mimeTypes, bool preferDesignMode)
 {
     int index = m_stackWidget->addWidget(widget);