Android: Qt 5.2 deployment add a button to create a Android manifest

The AndroidManifest.xml is no longer needed in as many use cases as
before. So the new deployment does not automatically create a
android manifest. Offer a button on the deployment page to create
a android manifest. This also edits the .pro file adding the
ANDROID_PACKAGE_SOURCE_DIR.

Change-Id: I2655dd6c96e2087732b4d7240b31fe9fcf168600
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

src/plugins/android/androiddeployqtwidget.h

@@ -70,6 +70,7 @@ private slots:
     void signPackageCheckBoxToggled(bool checked);
     void updateInputFileUi();
     void inputFileComboBoxIndexChanged();
+    void createManifestButton();
 private:
     virtual QString summaryText() const;
     virtual QString displayName() const;