Fix wayland activation

Adds support for xdg_activation_v1 when calling the application from the
system tray by using KStatusNotifier which supports it.
Listens to XDG_ACTIVATION_TOKEN as it's passed when we are started from
dbus.

src/controller.h

@@ -91,6 +91,7 @@ public:
     Q_INVOKABLE void openOrCreateDirectChat(NeoChatUser *user);
 
     Q_INVOKABLE void setBlur(QQuickItem *item, bool blur);
+    Q_INVOKABLE void raiseWindow(QWindow *window);
 
 private:
     explicit Controller(QObject *parent = nullptr);