Move Entity Definitions to JSON Files

[LucasSwitz]

Currently all entities are defined in Lua files. A JSON implementation will let factories parse through available entities more easily. All entity attributes that are currently bound to functions should have JSON string fields that link to a script that defines the function. This will require resolving Res() as part of a JSON file. Res resolution could be solved by simply making all resources be "Resource" objects that contain a field that says they are a resource.