Make a LAN (a decentralised, offline console) using Firefox OS

Use Firefox OS to create an offline console using `TCPSocket` to serve the catalogue and listen for controllers. And then open the Firefox Hotspot (tethering) so that controllers can connect to the WiFi SSID and control the games (via **`galaxy.js`** thing).

And use Service Worker so the games work when the players are offline, as long as the main Firefox OS console is on and its hotspot is on.
