* Updated the PathType and StorePathAction classes to allow for asserting if a path contains an executable.
* Converted the top-level argument group to use the new builder DSL.
* Updated tests for StorePathType to not actually test the functionality of the PathType class.
* Implemented a CompilerVersion type to mimic the existing wrapper in swift_build_support and return a more detailed object from ClangVersionType and SwiftVersionType.
* Updated action tests.
* Fixed a filter() mistake.
* Code review.
* Implemented a wrapper module around the standard argparse package, exposing the same interface with some extras on top, including a new builder type with expressive DSL for constructing complex argument parsers.
* Fixed imports in build_swift/argparse/__init__.py to make flake8 happy.
* More re-formmating to meet the exacting standards of the python_lint script.
* Added doc-strings to all the modules in the build_swift argparse overlay.
* Implemented a new BoolType for the argparse module which handles boolean-like values and replaces the hard-coded boolean values in the _ToggleAction class.
* Fixed the mess of imports in the tests sub-package to favor relative imports, so now the unit-tests will actually run as expected. The README has also been updated with a better command for executing the unit-test suite.
* Updated the add_positional method on the ArgumentParser builder class to only take a single action or default to the store action.
* Cleaned up the set_defaults method.
* Added validation test to run the build_swift unit-tests.
* Updated validation-test for the build_swift unit-test suite to use %utils.
* Fixed hard-coded default values in the expected_options module used for generating argument parser tests.
* Updated the comment in the Python validation test to run the build_swift unit-tests.
