On Mac, preferences from replays seem to be applied persistently

[NQNStudios]

I think I saw this happen, didn't confirm it, and forgot to write it down.

If it is the case, it'll be pretty annoying and worth fixing. We don't want replays to clobber our preferred settings.

It would make sense if Mac is doing it and Windows/Linux aren't, because Mac handles preferences differently.

[NQNStudios]

I confirmed it, but going back over the code I don't see how it's happening.

[CelticMinstrel]

I think the Cocoa preferences system syncs preferences in the background or something. Maybe replays shouldn't touch anything related to NSUserDefaults? I'm not really sure of that though. Looking at the current prefs code, it does clearly look like they shouldn't get saved. Maybe an NSUserDefaults automatically syncs when initialized? I'm just speculating here.