- Added a `shutdown` boolean attribute to the `Interfaces` class to manage interface states.
- Updated the `eltex.ttp` template to include the `shutdown` command based on the new attribute.
- Modified expected configuration JSON files for various devices to reflect the new `shutdown` attribute, ensuring accurate testing and validation of interface configurations.
- Eliminated the main execution block from the Quasar model for cleaner code.
- Introduced new configuration files `config_1.conf` and `config_2.conf` for Quasar devices, detailing interface settings and IP configurations.
- Added expected output JSON files `config_1.expected.json` and `config_2.expected.json` to validate the parsing of Quasar configurations against expected results.