0.1.11-alpha

See #29

CLI

• Document CLI output format for commands
• No longer prins clap output (e.g. --help) as JSON
• Make --output-path optional in the relevant CLI commands (checkstyle, run-tests, find-exercises, get-exercise-packaging-configuration)
• Removed "core" field from progress update result

Core

• Immediately returns a constructed status when waiting on hidden status exercise
• Fix format of CourseData (made more fields optional)

Other

• Reworked CLI internals
• Moved tmc-langs-abstraction inside tmc-langs-framework
• Moved file-utils to framework