Dan Albert 5ee3afeddb Disconnect log signals on exit.
If we don't do this, the uvicorn server may log its shutdown after the
Qt application has closed, and the signal this attempts to emit may not
be valid. Disconnect the log signals when the application exits to
prevent that.

There's actually another solution that I thought would be better, but I
couldn't get it to work:
https://www.pyinstaller.org/en/stable/feature-notes.html#automatic-hiding-and-minimization-of-console-window-under-windows
describes a way to have pyinstaller hide or minimize the console rather
than disabling it entirely. I was never really fond of getting rid of
the console window in the first place, but it did bother some users. If
we could get the hide or minimize option working, that'd probably avoid
bothering users, but also make the logs much easier to find, get us out
of the trouble of maintaining our own log viewer, and fix the problem
mentioned in the comment I add here (the log window only works if
there's only one in memory log handler).

Another option would be ditching our log window and instead just having
that menu item open the log file or directory in whatever program the OS
defaults to (probably notepad). It would still have the quirk of maybe
needing to open more than one location, since logging is use
configurable.

Fixes https://github.com/dcs-liberation/dcs_liberation/issues/3278.
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