Add a new soft constraint in the conference scheduling example to maximize the number of favorite talks that attendees can attend based on their votes.

• Input:
  • Each attendees can star any number of talks. A star is a boolean (true is starred/favorite, false is not)
  • The input comes from an extra sheet in the xlsx called "Attendees", that have these fields:
    • Attendee ID: a string (might be the name, or an obfuscated version). For example: "John Doe" or "15".
    • Favorites: a comma-seperated list of talk codes. For example: "S03, S07; S17"
      • Non recognized talk codes must fail fast of course
• The constraint weight is parameterized, of course

Notice that most conference are scheduled before attendees vote on that favorite talks. And all of them are scheduled before the majority of attendees vote on their favorite talks (because they do that the week(end) before they go to the conference). So this constraints is more of a feature checkmark in many cases...