Implement option to make fields customizable before printout of badge

[mariobehling]

Users should have the option to edit fields on their badge before printing them out.

Implementation should be as follows:

1. Organiser should have the option to make fields customizable "Allow customizing of field"
2. This will result in a pop up "customize your badge before printing" when checking in.
3. Users can now choose the fields to customize or leave empty.
4. The badges get printed with the customized option.

[angrezichatterbox]

I would love to work on this issue. Could you assign it to me. Could I also get some idea on how exactly to use the application