Lila websocket

Handle incoming websocket traffic for lichess.org.

lila <-> redis <-> lila-ws <-> websocket <-> client

Start:

sbt
~reStart

Start with custom config file:

sbt -Dconfig.file=/path/to/my.conf

Custom config file example:

include "application"
http.port = 8080
mongo.uri = "mongodb://localhost:27017/lichess"
redis.uri = "redis://127.0.0.1"

Trusts X-Forwarded-For. Use only behind a reverse proxy!

Code formatting

Please sbt prepare before you submit a PR. This will reformats and do some auto refactoring the code.