Req: Blocks suppress resource spawning

[trevorjd]

This is a minor issue but a nice to have. I'd like to see blocks prevent re-spawning of resources. At the moment, our maps get littered by people leaving nerd poles all over the place to mark resources like bird nests. There are seven such poles visible in the image below and 11 more visible off screen without taking a step. The map looks like an astray