Document debugging methods

[daboross]

Just putting this here for now, it should eventually go in some documentation.

The best tool I've found for debugging network is mitmproxy, which can capture network traffic headed towards a private server, or traffic from a computer or VM.

Besides that, there's also the procedure of adding debug!() calls to a module, and then enabling debug output only in that module with the screeps-rs-client -d screeps_rs_ui::module::path syntax.