Do not swizzle a subclass of an already swizzled class #1287
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Description
One Line Summary
Prevent swizzling a subclass of an already swizzled class.
Details
This is mostly a cherry-pick from #1284 into the user model branch.
A couple changes required are that we swizzle UIApplicationDelegate twice. Once for appWillTerminate in OneSignalFramework and once for the notification methods in OneSignalNotifications.
I have also moved over the unit tests despite not being able to run them.
Testing
Unit testing
moved over but not runnable
Affected code checklist
Checklist
Overview
Testing
Final pass
This change is