Convert iOS and OSX projects to ARC

Fairly straightforward conversion assuming there are no weird patterns going on like retained delegates.

The only out of the ordinary change I can remember was in SPBinaryManager:

    -@property (nonatomic,assign, readonly) NSMutableSet *delegates;
    +@property (nonatomic, readonly, strong) NSMutableSet *delegates;

These delegates are retained by the set, I wasn't sure whether this is intended so I just left it. You could use a CFMutableSet with NULL retain and release callbacks or `-[NSValue valueWithNonretainedObject:]`