adding support for local commands via !

[trumankain]

Pull Request (PR) Checklist

• [ ] I have read the CONTRIBUTING doc
• [ ] PR is from a topic/feature/bugfix branch off the dev branch (right side)
• [X] PR is against the dev branch (left side)
• [X] Merlin compiles without errors
• [ ] Passes linting checks and unit tests
• [ ] Updated CHANGELOG
• [ ] Updated README documentation (if applicable)
• [ ] Update Merlin version number in pkg/merlin.go (if applicable)

Change Type

• [X] Addition
• [ ] Bugfix
• [ ] Modification
• [ ] Removal
• [ ] Security

Description

Add support for explicit system command per #53 via !

[Ne0nd0g]

@trumankain Thanks for making this pull request! We need to update all of the menus and the associated documentation.