Add support for CP1.0 style target inheritence in `pod init`

Introduce a danger file to check for `fit` and `fdescribe` in tests

[SourcesManager] Provide a deprecation path for access to Pod::SourcesManager

Fix non-modular header errors for vendored frameworks.

[FileReferencesInstaller] Ensure that headers from vendored frameworks do not end up in the HEADER_SEARCH_PATH when using modules.

[Generator::Plist] Ensure a CFBundleVersion is set for resource bundles