Copy .swiftmodule to enable access to Swift static frameworks

Fix docs for prefix header paths

Fix integration `prefix_header_file` with test specs

Update default Swift version to 3.2 for validation

Fix static_framework Swift pod deps and pod access to dep vendored modules

Fix static_framework Swift pod dependencies and implement pod access to dependent vendored_framework modules

Better warning message for which Swift version was used during validation

Strip vendored dSYMs during embed script phase

Warn when a pod that was added or changed includes script phases

Do not set a `CODE_SIGN_IDENTITY` for macOS app hosts or xctest bundles

Build pod targets with script phases and integrate them properly

Copy resources for static frameworks

Integrate execution position for shell script phases

Add support to integrate script phases from podspecs

Add app host support for test specs

Fix framework and resources paths caching

Ensure `SYMROOT` is properly set for all user configurations

Add support for preventing pch file generation

Build subspecs in static frameworks without error