* Import the Swizzler sources into github
* Add subspecs to GoogleUtilities podspec
* Add post install step to test Podfile to add the preprocessor flags required for testing.
* Add the swizzler tests (except the flaky GULAppDelegateSwizzlerTest) to the Xcode project
* Add the AppDelegateSwizzler internal headers to the ios test header search path
* Add license header to GULLoggerCodes.h
* Fix/Suppress warnings in the framework.
* Disable certain classes for tvOS and macOS as well fix some additional pod lib lint warnings.
* Modify imports as well as add the required preprocessor flags to the test targets.
* Run pod deintegrate.
