Update Rust Exporter

[JonBoyleCoding]

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Is your feature request related to a problem? Please describe.

The rust exporter currently outputs really old Rust.

Describe the solution you'd like

Update the rust exporter. These are things I noticed

• No need for extern crate lines
• No macro_use are necessary anymore
• Requires use serde::{Serialize, Deserialize}

Describe alternatives you've considered

Currently I'm rewriting the code automatically once generated.