Improve message when there is no spec in repos for a given dependency

[Installer] Also set APPLICATION_EXTENSION_API_ONLY when the user tar…

Add deployment target option for ibtool command in copy resources script

[InfoPlistFile] Ensure the version string is exactly three dot-separated numbers

[Validator] Validate that apps can import the Pod

[Validator] Compile with -Wincomplete-umbrella

[Init] Only create target definitions for native targets

[PodTargetInstaller] Preserve header_mappings_dir when copying header…

Fix handling of localized files in Pods installed as frameworks

Improve repo lint error messaging

- Revert Use `||=` as previous value of group is used in the line
- Pass the converted pathname into group_for_path_in_group
- Fix spacing in Argument Error output
- Fix wrong variable name in Argument Error output

- Remove duplicate argument check from add_file_reference.
  This will make the stack trace a little less concise, as the private
  group_for_path_in_group will show up as the topmost item. However it makes
  the method more readable.
- Make lproj_regex case-insensitive
- Use `||=` instead of wrapping `||` over multiple lines