0.7.0

What's Changed

• Introduce PIF based compiler by @giginet in #38
• Update argument parser by @giginet in #41
• Remove FileSystem by @giginet in #39
• Remove xcodebuild backend by @giginet in #42
• Rename Package to DescriptionPackage and fix resolveBuildProduct logics by @giginet in #43
• Use upstream SwiftPM by @giginet in #44
• Introduce ErrorDecoder by @giginet in #46

Full Changelog: 0.6.0...0.7.0