Issue Description: Custom heads from the Head Database plugin are rendered as Steve heads. Could this be a setting in my config? I can see the custom heads properly in-game.

• Dynmap Version: Dynmap version: core=3.1-beta3a-409, plugin=3.1-beta3a-409
• Server Version: This server is running Paper version git-Paper-138 (MC: 1.16.1) (Implementing API version 1.16.1-R0.1-SNAPSHOT)
• Pastebin of Configuration.txt: https://pastebin.com/yHTzgZ6A
• Server Host (if applicable): Self hosted
• Pastebin of crashlogs or other relevant logs: N/A
• Other Relevant Data/Screenshots: https://imgur.com/a/Y77sJ1Q
• Steps to Replicate: Place a custom head in game, when it renders on the map it will be a Steve head.

[X] I have looked at all other issues and this is not a duplicate
[X] I have been able to replicate this

Thank you for your feature request. Due to the volume of feature requests we receive we have relocated all of our features requests to a single issue #3461.

I don't think this is a bug- im not sure you've every been able to see player heads just like you can't read sign text from dynmap

Thanks for the reply, if possible, please move this over to suggestions then, I think if dynmap can gather player skins it should be able to render custom heads as well 👍