UDP Multicast functionality

[usedhondacivic]

I mistakenly believed host networking through docker wasn't available on Mac and Window's hosts. This is incorrect https://docs.docker.com/engine/network/drivers/host/#docker-desktop. Host networking is required for UDP multicast, which is the most ergonomic way to achieve device discovery / communication. In addition to allowing multicast, host network mode improves performance and should remove many Docker related networking issues.

This issue tracks implementing UDP multicast.

[usedhondacivic]

Due to #10, closing this in favor of little-red-rover/lrr-firmware#15