Query:
- Finalize Safe Complex Query expressions base
- Implement operator 'value', does valueOf()
- Implement Date Object operators:
  - Date: the Date constructor
  - time: set year, month and day to January 1st 1970 UTC
  - year: getUTCFullYear()
  - month: getUTCFullMonth()
  - day: getUTCDate()
  - hours: getUTCHours()
  - minutes: getUTCMinutes()
  - seconds: getUTCSeconds()
  - milliseconds: getUTCMilliseconds()
- Add 15 tests
- Update documentation