* [Rust] Move request logic into standalone file
This reduces the number of variables which are used in the generated
operations, thus fixing #512.
This also fixed a TODO related to URI parsing errors.
Other than that, it is meant to be functionally identical.
* [Rust] Add support for non-file form params
Up until now, they just weren't there at all
* [Rust] Use more rustic terms in example
* [Rust] Consider error statuscodes to be errors
* [Rust] Introduce 'ApiError' type for 4xx/5xx resp
This updates the previous commit which added an 'ErrorStatus' variant to
an 'ApiError' variant.
It does not specialize the error to the specific possible error
responses yet, rather returning a 'serde_json::Value' for any case.
This will lose any error messages which cannot be parsed as json and
instead return a json-parse error.
A future change should update the generated signatures such that the
returned future's error type is specialized to the specific errors that
may be returned by that api (and possibly a catchall json::Value still).
* [Rust] Regenerate petstore samples
* [Rust] Add error example to petstore sample
* Use the right package name for the Rust crate.
* Change getters on models to return Option for non-required fields.
* Cleanup Rust generation and get example compiling again.
* Use underscore names for functions.
