Dev:Updating extensions for iOS 13

Let's collect knowledge like we did with 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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= What has changed in iOS 13? (Classes, frameworks, etc.) =

Generating an apps icon image
Previously an icon image could be generated from an icon object like so

In iOS 13 this method was changed to

UIDevice issue
may causes some process crashes when it called in %ctor

To reproduce that, add this to your tweak, then change your wallpaper via Settings. The device gets stuck and reboot.