Interpreter-driven Object Properties

[gorlak]

Right now the properties of objects selected in the editor are driven entirely by fixed-function code through descrete Panels that are registered with factory functions at Editor startup. Instead we need to invoke ReflectInterpreter to generate the properties of the selected objects using reflection information from Reflect. This probably doesn't need to be component-system aware yet, but that will come in a subsequent ticket. This ticket is to just gut the panel system and start utilizing ReflectInterpreter. Gutting panels should vastly simplify processing selected objects in the properties generator.

[gorlak]

hooray progress!