Add workplace marker graphic (footprints)

[Treer]

Seeing player skins on buildings had me thinking the engine had bugged out, but I see these are the workplace markers, and the short term intent was to show them as footprints

So I've made them footprints on my server

[Sokomine]

Thanks! This is very helpful. I've been wishing for such a texture for quite some time. The player skin was just a placeholder.