Brainstorming new factorization
Sim V2
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* Added back all existing functionality in terms of the new infrastructure
* Finished SpawnerAgent component, it can be dropped in world to manipulate the local population levels where you dropped it.
* Added IUIElement and UIGameScreen (intended for base class).
** Now you can register your set of ui elements in LoadContent and
   get your ui
Removed unused cruft
more de-crufting
Added ray pickability to organism agents. Click on them to target
Removed two more classes.