Update for Xcode 4

* No explict SDK
* Explicit deployment target, and use that setting in Info.plist
* Sparkle is now expected to be a binary distribution at
  ../Sparkle/Sparkle.framework
* Re-saved xibs, with no changes.
Fix warnings

* One deprecated method, with replacement since 10.6
* One oddly-spaced arithmetic expression
* Switch segmented control in drawer from deprecated
  textured round rect appearance to normal round rect.
Make triangle waveform actually triangular