Pr headless support

And here it is!

A whole lot of nothing going on!

This version of headless starts a multiplayer host game using the last Config options (with the next and last PR changing Terasology.java)  Edit: decided to just add the Terasology file change in here as well.  So this is it for a basic working version.

This patch is cumulative with all of the previous patches and by itself only creates the files in the headless package.