Event Log messages and styling

The event log messages need to be cleaned up.

Consider:
- include command being sent to docker
- remove stdOut prefix from message content
- consider coloring/labeling output based on event log message type
- don't use Display trait for message content (format!("{:?}", thing)), instead craft meaningful string using attributes of thing and or context of message.
- make event log tray resizable
- distinguish between last message bottom bar, and tray.
- Strip quote and special character escaping from displayed output