Update to "who deadly"

News #1247 posted by Gonnil on 2024-04-25 11:04:55.

When typing "who deadly", you will now additionally see any peaceful character
that is in an arena room, unless the room is set as a safe room where the
character cannot be attacked. The area name will be displayed in the who list
for every peaceful character as well.

This change was made to boost activity by easily displaying which characters
are in arenas and able to engage in player vs. player combat.