Add more customization options and better formatting for missions panel

[ElonOlsson]

I suggest the panel should support: (Feel free to add on to the list)

• [ ] Line breaks
• [ ] Multiple text paragraphs
• [ ] Multiple images
• [ ] Images other than online URL links, like local and/ or synced
• [ ] Clickable links in the text, to docs for further reading for example

[alexanderbock]

Generally, adding more customizability.

Maybe using MarkDown for mark-up of the mission text?

[WeirdRubberDuck]

I updated the title to be more self-explanatory and include what was said about customization. I hope that's ok.

It's good if all issues, even if they are designed as sub-issues, are self-continaed