Add option to automatically rewrite server.properties file

This tries to fiend the server.properties file of the Minecraft server,
and sets the correct IP and port as configured within lazymc. This is
enabled by default.

src/main.rs

@@ -10,6 +10,7 @@ extern crate log;
 pub(crate) mod action;
 pub(crate) mod cli;
 pub(crate) mod config;
+pub(crate) mod mc;
 pub(crate) mod monitor;
 pub(crate) mod proto;
 pub(crate) mod proxy;