New, shiny and unit-tests meta-info system for entities. This means that you can now query e.g. what kind of type an object is and what is it's parent class and what are it's child classes.
Additionally, you can attach arbitrary extended information to each class. This will be used in ui subsystem to attach the corresponding view-factory to an entity class.
Merge branch 'master' of https://github.com/daniel-kun/omni