Canonicalize names around request concepts

[efronbs]

Currently there is no consistency around the naming of different concepts in Fili. Terms like "Definition", "Configuration", "Maker", "Template" and many terms have slightly different meaning depending on the context they are used in. Even among concepts with similar meanings, such as configuration time scaffolding classes, there is little parity between these terms.

We need to determine strong meanings for these different terms, and go through the different pieces of the code base and rename all classes to be consistent with the new definitions.