Instead of hard coding the shaders we now allow the terrain property to
supplied data about the shaders. This is not optional currently, since
we expect the clients to understand the different layers (like "sand",
"grass" etc.), but we'll leave it at that for now.
It's currently a copy of the Mason ruleset.
Where Mason focuses on letting the users create the world themselves,
Deeds instead focuses on allowing world authors to set up enticing
worlds with gameplay and stories. In contrast to Mason there are more
features available to the world authors which allow for automatic
creation of entities and so on.
