saveLoadSettings()/saveLoadSlot() previously let a read failure (e.g. a
version mismatch from the new schema check) propagate all the way up
through saveUpdate()/engineUpdate() to main(), which just prints the
error and exits - taking down the whole game over one bad file. Both
now catch the failure, log it, and fall back to init defaults instead,
matching the existing "no file yet" convention.
YourWishes
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