Support AutoFactory generation

[jeremydmiller]

Much, much later. I'm theorizing that the code generation should make this fairly simple and way more efficient than SM's version of the same, much less SM's old explicit argument feature

[CodingGorilla]

Since Lamar isn't using the code generation anymore, should this maybe be a separate package, like it was for SM so that anyone who doesn't use the feature isn't bringing extra dependencies. I'm guessing that without the codegen, the feature is going to function similar to SM's in that it's going generate a "stub" that uses interception to respond to the requests, and hence a dependency on Castle.