Initial attempt at refactoring API scope declarations.
- Declaring an endpoint's scopes in a `before` block has proved to be unreliable. For example, if we're accessing the `API::Users` endpoint - code in a `before` block in `API::API` wouldn't be able to see the scopes set in `API::Users` since the `API::API` `before` block runs first. - This commit moves these declarations to the class level, since they don't need to change once set.
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