visual enhancements for sims

[cjpappas]

A collection of visual enhancements that might be nice to work on if time/boredom permit.

• Change wayfinding (task 2) arrows so they have some visual indication of what number they are
• Change arrows for wildlife (task 4) sim to actual pictures of the respective animals
• Make the ping in the channel (task 5) simulation show up as a circle, animate it if feeling like being challenged.