- Avoid ConcurrentModificationException when `getMachines()` by deep clone the machine map
- Enhance the code to avoid potential ConcurrentModificationException
- Add test cases
- Update dashboard API client to support authority and parameter flow commands
- Add REST API controller for parameter flow rules in dashboard
- Add pages for configuring parameter flow rules
- Update dependencies: upgrade Spring Boot to 2.x and remove unused dependencies
- Other refinements
Signed-off-by: Eric Zhao <sczyh16@gmail.com>