Preferences: start to port preferences to a more sane design

Our preferences dialog right now is a rather huge dialog
with more than 9 subpages, and all of those pages are programmed
inside of the same class, same methods and all that - which means
that if I change something on the dialog I can break any
other thing quite easily.

The idea of this patch series is to make it harder to break
user settings and the settings dialog.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

desktop-widgets/preferences/abstractpreferenceswidget.cpp

@@ -0,0 +1,21 @@
+#include "abstractpreferenceswidget.h"
+
+AbstractPreferencesWidget::AbstractPreferencesWidget(const QString& name, const QIcon& icon, float positionHeight)
+: QWidget(), _name(name), _icon(icon), _positionHeight(positionHeight)
+{
+}
+
+QIcon AbstractPreferencesWidget::icon() const
+{
+	return _icon;
+}
+
+QString AbstractPreferencesWidget::name() const
+{
+	return _name;
+}
+
+float AbstractPreferencesWidget::positionHeight() const
+{
+	return _positionHeight;
+}