Fixed tests.

Cleaned up warnings.
Include swift build command output with --verbose.
Updated dependencies.

Minor cleanup.
Bumped version to avoid slight confusion with 1.2.0 tags.

Switched to using Apple's new argument parser.

Allow passing in optional full path to Info.plist. Useful for situations where the executable has a different name from the target.

Added support for linking plist into __TEXT section.
Changed metadata to write information into this plist.

Added .git for dependent packages.

Updated dependencies.
Required macOS 10.13.

Added 10.11 and 10.14 to minimum platform mappings.

When building the metadata, pick up version using git describe --tags, rather than trying to parse the version tags in git describe --all.

If we're ahead of the last tagged version, the metadata version will now be of the form x.y.z-d-cccccc, where x.y.z is the last tag, d is the number of commits since it, and cccccc is the commit.