Improve window title retrieval/hierarchy walk

[zieren]

We still sometimes see titles like "Open file" or "Logging in". Maybe that can be fixed, possibly by considering the process. (Should we even send the process to the server for classification?)

• https://stackoverflow.com/questions/507848/win32-window-owner-vs-window-parent
• https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getancestor