Android: Make local deployment smart

On deploying, first check the timestamps of the files on the device,
and then only copy+strip+deploy the files that are newer.
Add a button for cleaning /data/local/tmp/qt as that is no longer
done on each deployment.

Task-number: QTCREATORBUG-8538
Change-Id: I93c4e6266d7d748b0a4735e00806282315227d4b
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/android/androiddeploystepwidget.h

@@ -54,6 +54,7 @@ private slots:
     void setQASIPackagePath();
     void useLocalQtLibsStateChanged(int);
     void editRulesFile();
+    void cleanLibsOnDevice();
 
 private:
     virtual QString summaryText() const;