Telemetry stub.

This is experimental, off-by-default, code for developing a telemetry /
tracking configuration module. It is preliminary work for issue #628,
but also for KDE Neon configuration. Any telemetry should conform to
the KDE Telemetry Policy [1] or similar Free Software telemetry policy
(e.g. the Mozilla one).

[1] https://community.kde.org/Policies/Telemetry_Policy

Initial idea is to distinguish three kinds of tracking:
 - installs. This tracks that OS <foo> has been installed somewhere.
   It might send some machine information to a remote server.
 - machines. This enables some kind of machine tracking in the

   installed system, for instance it could enable popcon on
   Debian, or periodic phone-home-pings.
 - users. This enables some kind of telemetry / tracking on the
   installed user in the system.

A simple and transparent setting is to enable install-tracking and set
it to opt-in, and disable machine and user tracking. Explain to the
user that <foo> would like to know when <foo> is installed, and that
the following information <d1>, <d2> will be sent to <url> in accordance
to the <foo> telemetry policy at <url2>.

Work in this branch is subject to VDG review for the visuals, and
privacy oversight by whatever group is responsible for <foo> privacy.

Note that this module makes it *possible* for telemetry configuration
to be visible inside the installer; what distro's do with telemetry
already is entirely outside the scope of this configuration module.

src/modules/tracking/TrackingViewStep.cpp

@@ -0,0 +1,109 @@
+/* === This file is part of Calamares - <http://github.com/calamares> ===
+ *
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "JobQueue.h"
+#include "GlobalStorage.h"
+#include "utils/Logger.h"
+
+#include "TrackingViewStep.h"
+#include "TrackingPage.h"
+
+#include <QVariantMap>
+
+CALAMARES_PLUGIN_FACTORY_DEFINITION( TrackingViewStepFactory, registerPlugin<TrackingViewStep>(); )
+
+TrackingViewStep::TrackingViewStep( QObject* parent )
+    : Calamares::ViewStep( parent )
+    , m_widget( new TrackingPage )
+{
+    emit nextStatusChanged( false );
+}
+
+
+TrackingViewStep::~TrackingViewStep()
+{
+    if ( m_widget && m_widget->parent() == nullptr )
+        m_widget->deleteLater();
+}
+
+
+QString
+TrackingViewStep::prettyName() const
+{
+    return tr( "Telemetry and Tracking" );
+}
+
+
+QWidget*
+TrackingViewStep::widget()
+{
+    return m_widget;
+}
+
+
+void
+TrackingViewStep::next()
+{
+    emit done();
+}
+
+
+void
+TrackingViewStep::back()
+{}
+
+
+bool
+TrackingViewStep::isNextEnabled() const
+{
+//     return m_widget->isNextEnabled();
+    return false;
+}
+
+
+bool
+TrackingViewStep::isBackEnabled() const
+{
+    return true;
+}
+
+
+bool
+TrackingViewStep::isAtBeginning() const
+{
+    return true;
+}
+
+
+bool
+TrackingViewStep::isAtEnd() const
+{
+    return true;
+}
+
+
+QList< Calamares::job_ptr >
+TrackingViewStep::jobs() const
+{
+    return QList< Calamares::job_ptr >();
+}
+
+void
+TrackingViewStep::setConfigurationMap( const QVariantMap& configurationMap )
+{
+}