Compatibility for iOS 7.x/8.x
Compatibility for iOS 7.x/8.x

In iOS 7.x/8.x, the method `-[PrefsListController _reallyLoadThirdPartySpecifiersForProxies:withCompletion:]` apparently takes no arguments inside completion block, so the hook may work with or without side effects. Anyway this fixes crash as tested on my iOS 8.x simulator. Notably, this change also fixed duplicate entries bug because of my misunderstanding about `-[NSMutableArray removeObjectsInArray:]` There are few more changes that may improve the stability of PO2.
angelXwind/PreferenceOrganizer2,angelXwind/PreferenceOrganizer2,GaryniL/PreferenceOrganizer2,angelXwind/PreferenceOrganizer2,GaryniL/PreferenceOrganizer2,GaryniL/PreferenceOrganizer2