[TSK-28] - Unit Tests and Improvements

[phrp720]

This pull request includes multiple updates to the aw-sync-agent project, focusing on enhancing the Makefile commands, improving the documentation, and adding new unit tests. The most important changes include adding new service commands to the Makefile, updating the README to reflect these changes, and introducing new tests for various components of the project.

Makefile Enhancements:

• Added new service commands (SERVICE-START, SERVICE-STOP, SERVICE-REMOVE, SERVICE-RESTART, SERVICE-STATUS) to manage the aw-sync-agent service on both Windows and Linux. [1] [2] [3]

Documentation Updates:

• Updated README.md to include new sections for general and service commands, and to clarify the requirements and steps to run the agent. [1] [2] [3] [4]

Code Improvements:

• Refactored checkpoint.go to use getter and setter methods for the checkpointFile variable. [1] [2]
• Changed the sett struct to Setts and made related function names public in settings.go. [1] [2] [3]

New Unit Tests:

• Added comprehensive unit tests for the checkpoint, cron, filter, and settings packages to ensure their functionality. [1] [2] [3] [4] [5]