ESP
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Linux: prompt to save on exit (instead of asking for save file name).
With options to save, save as, or cancel.
This might be harder than it should, as openFrameworks doesn't seem to support this kind of dialog box. See: https://forum.openframeworks.cc/t/how-about-a-yesno-dialogue-box/14001 for one possible implementation.
See #306
Need to get the yes/no / ok/cancel dialog working on Linux.
Since linking against GTK seemed cause problems for all dialog boxes (#322), maybe this will work if we don't link against GTK?