Ability for attendees to mark themselves as "Maybe"s

[Theomn]

Similar to Facebook or Partiful, I would love if attendees could show their interest even if they're unsure if they will be able to come, to have a better idea of how many people will actually attend the event.
Here are some of the feature implications I could think of:

• In the "Add me" prompt, add a field for attendance type : either "Going" or "Maybe/Interested"
• In the attendees list, display all maybes in a different color and/or in a different section below it
• Adding functionality to removal password: using the password opens a prompt to either remove yourself, or change your attendance type.
  • Change the name of "removal password" to "edit password"
• In the edit event interface, event admin can change attendance type for each individual attendee with a toggleable icon.

[nklisch]

I have a POC I actually threw together before I saw this, as I was looking for the same. I'll be openning a PR sometime here after I clean it up a bit.