Dev:Updating extensions for iOS 15/16

Let's collect knowledge like we did with iOS 14, iOS 13, iOS 12, iOS 11, iOS 10, iOS 9, iOS 8 and iOS 7 – paste in your notes and share what you've learned, and somebody else will organize it later. :) If you want to ask questions and share tips over chat with other developers, see How to use IRC for how to connect to #theos and #iphonedev.

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New Signing Requirements
iOS 15.0+ requires DER encoding of the entitlements, as such it is required that all tweaks are signed with an updated. iOS 15.1+ adds a requirement on hash agility, added in  version   which can be found here.

SBHIconGridSizeClassSizes
in all arguments of methods and functions is now passed via pointer, instead of being passed as a raw struct.

You can write code that supports both versions like so: