Remove some unused frameworks

This started with an error building under 10.9. It can't find the Messages.framework (although it seems to be there). Anyway, I saw that it wasn't used so I removed it. Then I started looking at all the other included frameworks and wondering what else we could take out. I think I've pared it down to what we actually need.

I also removed a few imports as I found them, and all the iSync stuff.

It seems like we should be able to remove the Carbon framework from everything other than the QSFoundation target, but when I try it, things don't go so well. :smiley:

This is not an attempt to clean up *all* unused stuff. I'm sure there are many, many more `#import` statements we could drop.