Revisit Mockable Member Determination

[JasonBock]

The way the GetMockable...() methods work seem convoluted and messy. I really need to look at this and see if there's a cleaner way to get all the things from the given type in a way that is straightforward.

[JasonBock]

At the very least, move the GetMockable...() methods to classes, refactor the flow, make it easier to follow.