[PATCH v38 0/9] MR2808: SNI tray implementation

[Cherser-s (＠Cherser-s)]

Adds the tray icons implementation based on org.kde.StatusNotifierItem interface usage. Does allow restarting StatusNotifierWatcher object, but will fallback to XEMBED or internal tray, if wine gets initialized when there is no StatusNotifierWatcher object registered.

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  v38: win32u: Handle dbus notification balloons from system_tray_call
       win32u: Handle notification balloons through org.freedesktop.Notifications dbus interface
       win32u: Handle StatusNotifierItem management from system_tray_call
       win32u: Handle StatusNotifierWatcher owner changing and registering objects to a new watcher
       win32u: Add SNI driver for systray handling
       win32u: Add DBus event loop for SNI handling

https://gitlab.winehq.org/wine/wine/-/merge_requests/2808