Custom flags for members page

[Embraser01]

Is your feature request related to a problem? Please describe.
Sometimes, a registration of member can be made without having their K-Fêt card delivered. This idea aim to handle this case instead of just doing it manually.

Describe the solution you'd like
The solution I've found is:

• On the members list page, add a configuration button with a popup
  • In this popup, someone can add custom True/False data for a registration
  • This settings will now apply for all the new registrations
  • Each flag have a default value (true or false) which will be the default state when creating a new member.
• When creating a new member, below the mandatory fields, each flags is displayed (checkbox list).
• It can be edited before creating the member.
• These flags are related to 1 registration (currentYear)
• We can find these flags again in the edit page where it can be removed.

Describe alternatives you've considered
This solution is a little bit more complex than a simple checkbox 'isRegistrationComplete' but can handle almost everything and could be useful if one day we consider having stats about members 😉

Additional context

Solution resolving an item of #355.

@kistora what's your opinion on this ? (if you understood it 😄)

[corentingiraud]

Very good idea. I will work on it after #389