1. update example AthMonitorAlgorithm to use new Monitored interface names
2. refactor fill() function to avoid code duplication

1. implement a manual fill wrapper for offline monitoring
2. revert change in GenericMonitoringTool default path to 'EXPERT'. This will
   be fixed in another MR
3. Update example AthMonitorAlgorithm daughter class for changes to base class

1. Cleanup boilerplate code
2. Change property declaration to new method
3. Change function names in AthMonitorCfgHelper
4. Add AOD to TestDefaults.py
5. Add override keyword to functions