Dev:Updating extensions for iOS 9.3.3

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Unlike previous instances of "Updating extensions for iOS X", this specific version has several internal changes as well as a different public jailbreak method which demands a separate page for it.

= What has changed in iOS 9.3.3? (Classes, frameworks, etc.) =

com.apple.accessibility.system.app.server.ready, com.apple.frontboard.systemappservices.serverNotifyToken, SBSpringBoardDidLaunchNotification, com.apple.springboard.finishedstartup, com.apple.sharing.SpringBoard.started, com.apple.springboard.homescreenunlocked are some of the notifications to register for.
 * SBUIController's -finishLaunching ceased to exist. Consider using notifications to perform initializations of your tweaks if you were hooking this method.


 * SpringBoard's -_relaunchSpringBoardNow ceased to exist. Use [[FBSystemService sharedInstance] exitAndRelaunch:YES]</tt> (AFAIK there is no difference between YES</tt> and NO</tt> at the end).


 * To reboot, use [[FBSystemService sharedInstance] shutdownAndReboot:YES]</tt> and to shutdown, use [[FBSystemService sharedInstance] shutdownAndReboot:NO]</tt>


 * SBOrientationLockManager's -isLocked</tt> ceased to exist. There is now -isUserLocked</tt> (without lock override check) and -isEffectivelyLocked</tt> (with lock override check).