Rename internal schema data structures and variable names

[heyealex]

BlueprintConfig -> DeploymentConfig
YamlConfig -> Blueprint
ResourceGroup -> DeploymentGroup
Resource -> Module

Along with multiple other support data structures and variables. There are (very) likely leftover references that will need to be cleaned up as we find them, but this was a best-effort to grep/replace as much as possible.

Anything related to package names were not updated, including a few functions like WriteBlueprint. That will come in a future PR.

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