pseudocode 0.1.6

AP CSP Pseudocode interpreter (rough cut)
Documentation 
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# AP Pseudocode Interpreter

Includes:
- Rust library
- Command line interface
- Web interface

## Building

### Web Interface

Need installed: cargo, rust, npm

1. Install [`wasm-pack`](https://rustwasm.github.io/wasm-pack/installer/)
2. Install `cargo-generate`:
    ```
    cargo install cargo-generate
    ```
3. Initialize javascript setup from inside `web/www`
    ```
    cd web/www
    # if doing for first time
    #npm init wasm-app www

    cd www
    npm install
    ```
4. Run with
    ```
    npm run start
    ```

### Serving Statically

It is possible to build this so that you can serve all the file statically.
First, run `npm run build` to put the files in `web/www/dist`, then serve the `dist` directory.
Make sure that your webserver (e.g. nginx) is attaching the `application/wasm` MIME type for the `.wasm` resources.
You can enforce this in nginx by adding the following line to `/etc/nginx/mime.types`:

```
    application/wasm    wasm
```

## TODO

- [ ] list:
    - need to implement lists as a reference type
    - rather than embedding the backing Vec inside the Value enum, embed a reference to the Vec that is stored in a Scope environment
    - this would require expanding the Scope nevironment to hold references, likely in a separate dictionary?
- [x] negative numbers
- [x] negation
- [x] NOT
- [ ] native functions: implement in Rust
    - [X] CONCAT
    - [ ] SUBSTRING
    - [X] RANDOM
    - ~~[ ] DISPLAY (?)~~
- [ ] robot stuff
- [ ] stepped execution