add fallback for config failure

[art0007i]

idk if this is a good idea but I hate it when my mods don't load because the config files saved incorrectly

(maybe I should stop spamming alt+f4 to quit the game which crashes it during the exit procedure, so that the config files don't corrupt in the first place)

[XDelta]

I believe that File.Move will throw an exception if the destination path already has a file. IE if consecutive config fails occur or the old failed config wasn't removed after fixing the issue.

[XDelta]

Either add an overwriting bit or write a unique filename to avoid. Don't have an overwrite option on File.Move until like .Net Core 3.