[Outdated] Refine pod outdated to show what pod update would do
[Outdated] Use the Analyzer to resolve the unpinned pods
[Outdated] Update for release CocoaPods version
Merge pull request #2501 from CocoaPods/feature/outdated

[Outdated] Refine pod outdated to show what pod update would do
[UserProjectIntegrator] Allows the use of the `GCC_PREPROCESSOR_DEFINITION` flag `${inherited}`  without emitting a warning

Closes https://github.com/CocoaPods/CocoaPods/issues/2577