FR: add condition for "prone"

[wmve]

here in this area

so that other places in UI where "prone" is selectable, such selections and be pre-filled according to the condition on the attacker or defender as appropriate

[github-actions]

Thanks for opening an issue, traveller!
If your issue is related to an actor or an item, sending thing that is broken will help a lot and speed up debugging.

How to send an item? > - If item is owned by a character, drag and drop it to world item list. > - Right click on item in browser item list and click export. > - Attach downloaded item to this ticket.
How to send an actor? > - Right click on actor in browser actor list and click export. > - Attach downloaded actor to this ticket.