Analyzer: Add status label.

Factor out the status label with timeout from the debugger plugin.
Use in analyzer manager, add standard messages and use that
in memcheck.

Task-number: QTCREATORBUG-4077
Reviewed-by: Daniel Molkentin <daniel.molkentin@nokia.com>

src/plugins/memcheck/memchecktool.h

@@ -111,6 +111,7 @@ private slots:
     void internalParserError(const QString &errorString);
     void updateErrorFilter();
     void suppressionActionTriggered();
+    void finished();
     QMenu *filterMenu() const;
 
 private: