Support for COLOUR on VEVENT from RFC 7986

[d3jv]

Checklist

• I have used the search function for OPEN issues to see if someone else has already submitted the same feature request.
• I have also used the search function for CLOSED issues to see if the feature is already implemented and just waiting to be released.
• I will describe the problem with as much detail as possible.
• This is not about the docker image. In that case, contact the authors of the docker image.

Baikal version

0.11.1

PHP version

8.3

Problem you are having

Hi, I'd love to be able to use per-event colours but it seems like it's not supported - none of the clients I tried let me set the colour when creating an event hosted on baïkal but they do when I use a calendar from Radicale.

Suggested solution

No response