Sweet16 speaks Unicode

At least, the program is running apparently correctly, now using Unicode strings for pathnames, filenames, and the like. I've only tested very slightly using file names with special characters, and so far it works, but I don't know how reliable it is yet. It needs a boatload of testing.

I may be putting out a call for folks that use Sweet16 on machines where English is not their primary language and are willing to make a backup of their stuff and try this thing out, under the understanding that it may very well toast their disk images, the Sweet16 preferences, and so forth. Happy

I'm going to try to tackle a few more of the less intense things I'd like to fix before I do that, though.