Feature Description: A layer has been added for offline players (#451). Althought, it would be nice to be able to display as an icon the player's head. Even better if it was in a black and white version).

• Additional context: For now, the default is offlineuser which ressembles to "👤". The closest possible thing to do is to use the same player's head for all the offline players. This is the piece of settings for this functionality:
  

  dynmap/forge-1.20/src/main/resources/configuration.txt

  Lines 129 to 135 in 105d4f1

  	# (optional) layer for showing offline player's positions (for 'maxofflinetime' minutes after logoff)
  	showofflineplayers: false
  	offlinelabel: "Offline"
  	offlineicon: offlineuser
  	offlinehidebydefault: true
  	offlineminzoom: 0
  	maxofflinetime: 30