auto-update ios and osx xcode project formats, closes #1409

This updates the Xcode project format of the OSX and iOS template Xcode projects, as well as the openFrameworksCompiled project.

This was done by just opening up the projects in Xcode 4.6.3 and allowing it to auto-update the project file. The only omission was preventing it from switching the scheme's default debugger from GDB to LLDB, since that seemed like a PR for another day :)

Tested with Xcode 4.6.3, 4.2 and 3.2.6.

@julapy does this cover everything you had in mind on issue #1409?