Changes affecting everybody (using Qt): rename game->Save to
game->Save-and-exit and game->Quit to game->Quit-without-saving.
OSX-specific changes: add separate nethack->Quit and change
game->Quit-without-saving to game->_Quit-without-saving to prevent
that from being hijacked for the nethack menu. nethack->Quit menu
entry works. Command+Q is a keyboard shortcut for it. They bring
up a menu with choices of "Quit without saving" and "Cancel and
return to game". It's not the same as the handler for the window
Close button, which used to offer "Save" or "Cancel" (with the
latter triggering an infinite loop) but now offers "Save and exit"
or "Quit without saving". They don't share any code. The
game->_Quit-without-saving entry doesn't work; it runs nethack's '?'
command like a bunch of other broken menu entries. If it did work,
it would give nethack's "Really quit?" prompt and proceed from there.
The "Quit without saving" response for nethack->Quit confirmation
bypasses that and just quits.
Also OSX, add a second 'about' entry. The first one is hijacked and
added to the nethack menu, the second is help->_About_Qt_NetHack_
and avoids hijacking. Both nethack->About and help->_About_ bring
up the same dialog box showing version and assorted other info.
A lot of flailing about with for relatively small amount of progress.
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