AppKit: fixed some more flaws in the .xcodeproj

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
AppKit NibTest: hopefully compilarion has now been fixed

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
CoreFoundation.framework: upgraded to compile with Xcode 6

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>