Qtfred autosave system#7463
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Entirely removes the old undo system (backup.00#) from QtFRED and replaces it with a timed autosave feature. Timer defaults to 5 minutes and is configurable in Preferences. Additionally, users can enable/disable writing .bak files upon normal saving in preferences.
This is the first step towards QtFRED's true undo system where ctrl-z/y work entirely in memory and do not read/write files to disk as a sort of ad-hoc undo. Later phases for the undo system will follow this PR in manageable chunks.
Some save_config fields were removed/added to keep FRED2 working with the old undo system for now. That can all be removed once FRED2 is deprecated.