* Adjust header search paths and legacy working directory for relative included projects
* Undo change to HEADER_SEARCH_PATHS
* Add test
* Update changelog
* Fix test
* Undo test changes
* Fix tests
* Add 'useBaseInternationalization' setting to SpecOptions (default value of true)
* Update PBXProjGenerator to only include Base into knownRegions if it was either detected on the filesystem or if the project spec options opt into it
* Update ProjectSpec.md to include useBaseInternationalization
* Update AnotherProject to demonstrate Base Internationalization opt out
* Update CHANGELOG.md