[FR] Add markdown editor for event description

[leludo84]

Add markdown editor for event description in modal event like notes or summary.

This will help us to describe the event in detail with possibly screenshots (existing attachment feature in notes and summary).

It's easy to code but you will have redundant html and javascript code (exact copy of editor line in notes and summary). You may factorize this in a king of module (template ?).

[whikernel]

Hi @leludo84

Thanks for the issue. It's indeed planned. We also want to extend it all case modals which contains textarea descriptions. We need to find a way to do it properly in the smaller area offered, and also for the events figure out how to handle the rendering on the timeline since part of the description is displayed there. With a lot of events this might significantly impact the loading time.