Debugger: Split Expressions view into dock of its own

Change-Id: Ie86a5bd72c3140219f925835a065d9f6a3ae0ea4
Task-number: QTCREATORBUG-19167
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/debuggermainwindow.h

@@ -131,6 +131,7 @@ public:
 
     void showStatusMessage(const QString &message, int timeoutMS);
     QDockWidget *dockWidget(const QByteArray &dockId) const;
+    void raiseDock(const QByteArray &dockId);
     QByteArray currentPerspective() const { return m_currentPerspectiveId; }
     QStackedWidget *centralWidgetStack() const { return m_centralWidgetStack; }