[Plug-in Framework] Adendum to the goals document
I've added the Terrarium model and World Builder model definitions. The Terrarium model is based on the hardships in implementing the code hosting technology for the .NET Terrarium and the World Builder model is focused on slightly improving on the Terrarium model by extending the IL Verifier and talking about the use of factory types to manage memory allocations for types.
Plug-In Framework (Foreward): Defining the end goal