Implement basic web server capabilities

I'm moving this project from a classic Telnet-only server to a modern Web/Websocket server. This will setup basic support for that final goal:

 - [ ] Basic webserver boilerplate in place
 - [ ] Websocket connectivity library
 - [ ] Support Lua as route handlers and response builders
   - [ ] Explore MVC style framework for Lua handlers
 - [ ] Make `dragon serve` start the webserver.