GraphicComActive: polyPins can now be null.  Fixes incorrect bbox gen.
GraphicGen: Placeholder now has null polyPins for correct bbox
EditorComponent: No longer has responsibility for linking to world
EditorWorld: Now has responsibility for linking editor components
EditorPanel: Updated to reflect architecture changes
Added Evaluator<T> interface
Toolbox: Now uses Evaluator<T> to automagically change button targets
ToolboxButton: Now has a target evaluator
EditorToolboxLinker: Refactored.  Will likely be removed.