This adds some wine-only messages, but most of those are cases that follow an existing EVENT_SYSTEM_FOREGROUND wine-only message, so likely correctly reflecting a thing Wine is already known to do wrong.
The exception is WmRestore_3. https://testbot.winehq.org/JobDetails.pl?Key=146025 suggests that's also a case where focuses the window and shouldn't.
-- v2: win32u: Send EVENT_OBJECT_FOCUS in more cases.