Show app version in debug settings

We should find a better home for the applicationVersion property,
but this is probably okay for now.

Fixes issue #706

pages/settings/debug/PageDebug.qml

@@ -11,7 +11,6 @@ Page {
 
 	GradientListView {
 		model: ObjectModel {
-
 			ListItem {
 				id: frameRateSwitch
 				//% "Enable frame-rate visualizer"
@@ -80,6 +79,11 @@ Page {
 				// TODO implement when venus-platform provides equivalent of QuickView.imageCacheSize()
 				// onClicked: Global.pageManager.pushPage("/pages/settings/debug/PageDebugMemoryQt.qml", { title: text })
 			}
+
+			ListTextItem {
+				text: "Application version"
+				secondaryText: Theme.applicationVersion
+			}
 		}
 	}
 }

src/theme.h

@@ -34,6 +34,7 @@ class Theme : public QObject
 	QML_NAMED_ELEMENT(ThemeBase)
 	Q_PROPERTY(ScreenSize screenSize READ screenSize WRITE setScreenSize NOTIFY screenSizeChanged)
 	Q_PROPERTY(ColorScheme colorScheme READ colorScheme WRITE setColorScheme NOTIFY colorSchemeChanged)
+	Q_PROPERTY(QString applicationVersion READ applicationVersion CONSTANT)
 
 public:
 	enum ScreenSize {
@@ -94,6 +95,10 @@ class Theme : public QObject
 
 	Q_INVOKABLE bool objectHasQObjectParent(QObject *obj) const { return obj && obj->parent(); }
 
+	QString applicationVersion() const {
+		return QString("v%1.%2.%3").arg(PROJECT_VERSION_MAJOR).arg(PROJECT_VERSION_MINOR).arg(PROJECT_VERSION_PATCH);
+	};
+
 Q_SIGNALS:
 	void screenSizeChanged(Victron::VenusOS::Theme::ScreenSize screenSize);
 	void screenSizeChanged_parameterless();