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
Use enums in synth switch

Because why the heck not?
Merge pull request #1 from JensAyton/triangle-fix

Triangle fix