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/watchhandler.h

@@ -103,7 +103,7 @@ public:
     void resetLocation();
 
     void setCurrentItem(const QString &iname);
-    void updateWatchersWindow();
+    void updateLocalsWindow();
 
     bool insertItem(WatchItem *item); // Takes ownership, returns whether item was added, not overwritten.
     void insertItems(const GdbMi &data);