Warning frenzy.

49 warnings, down to 11 (here at least). Makes the warning view much more useful ;-).

Things I left :
- `NSWorkspace_BLTRExtensions`: 2 warnings about `-launchedApplications` being deprecated. I would recommend killing some methods in that file, using the shiny *new* `-runningApplications` (10.6+) that takes over the old `NSDictionaries` from `NSWorkspace`. Some of those aren't even used (I did a quick check on the old Plugins repo and got some matches, so plugins should be checked).
- I left the 3 `#warning`s in `QSPlugInManager`. Yeah, I think those are mine, but I don't feel like tinkering with that class atm.
- @pjrobertson, there's a special one for you in `QSPluginUpdater.xib`. I can't fathom what Xcode is trying to tell me here...
- The 4 others are in the externals (and it makes me realize my count if of by some easy ones I fixed in VDKQueue). I'll do a pull req for those.