QmlOutline: Move QmlOutlineTreeView into it's own file

src/plugins/qmljseditor/qmljsoutlinetreeview.cpp

@@ -0,0 +1,20 @@
+#include "qmljsoutlinetreeview.h"
+
+namespace QmlJSEditor {
+namespace Internal {
+
+QmlJSOutlineTreeView::QmlJSOutlineTreeView(QWidget *parent) :
+    Utils::NavigationTreeView(parent)
+{
+    // see also CppOutlineTreeView
+    setFocusPolicy(Qt::NoFocus);
+    setExpandsOnDoubleClick(false);
+
+    setDragEnabled(true);
+    viewport()->setAcceptDrops(true);
+    setDropIndicatorShown(true);
+    setDragDropMode(InternalMove);
+}
+
+} // namespace Internal
+} // namespace QmlJSEditor