Move to a Maven configuration

Everything has been converted into a module format (excluding the client, but the source for that isn't available at this point).

Everything can be compiled via Maven. This can be done via a simple 'mvn clean package', with the respective .jar files being exported to /server/target/server-**.jar

I have also cleaned up the source code a bit, and put placeholders in areas where they didn't previously exist.

Finally, the file tree was cleaned up to make everything easier to navigate.