Classes under "rulesets" have been moved to "rules", and split up into
futher subdirectories matching their library. As a result we can now
better separate the python bindings, so that things that belongs to the
simulation are separeted from things that belongs to the ai.
This is now the preferred way to change the size of any entity, instead
of editing the bounding box. The "scale" property is either uniform if
only one value is present, or in all dimensions if all three values are
present.