Alerts cleanup

**Changes**
1. Removed alerts, and added a generic audit handler for events that are defined to be saved as event log entries
2. Added a convention for the plug in messages, so endpoints can send the messages to SC for processing.
3. Started the namespace changes for the plugin messages 

**Things remaining:**
1. Need to separate plug in dlls for heartbeats, custom checks
2. Need to change the project names for the plug in dll
3. Need to update the nuget package!!