Logging should both short and informative, so I can see general info in terminal but still able to get more details later

[akoptelov]

The most general idea:

• Have only higher severity events logged to terminal by default (info, warn, error)
• Have all events with lower severity threshold logged to a file (debug, info, warn, error)
• Have separate options for both logging levels (--log-level and --file-log-level)

Also we might want to add logging filtering basing on pattern matching against action kind string (or lower severity threshold?).