1. Reworked working with command-line arguments
2. Added service control actions: install/uninstall/start/stop/status
3. Added log settings to the configuration file
4. Updated the README file
Filters are now saved to a file
Also, they're loaded from the file on startup
Filter ID is not passed to the CoreDNS plugin config (server-side AG DNS must be changed accordingly)
Some minor refactoring, unused functions removed