Rendering models instead.
More control in components, made actions adhere to serializing.
Added a component loaded listener for the manager. Let entities know of
the manager, in order to create more complex entities (relationships).
Refactoring.
Attach userdata to static rectangle. Goal is to make component more
generic, letting the userdata specifiy bodytype, friction, mass etc.
s_0 is allocated for keys (textures or textureregions).