Use the OpenAI ChatGPT API

This plugin is under development and probably shouldn't be used by anyone...

Get an API key from https://platform.openai.com/account/api-keys (free)
```
@config plugins.chatgpt.api_key YOUR_KEY_HERE
```
system prompt:
```
@config plugins.chatgpt.prompt "You are $botnick the IRC bot. Be brief, helpful"
```
^^ Configurable per channel, etc. get creative
```
@chat <text>
```
^^ Command to send text to the chatgpt API

```
@messageparser add "(?i)(.*BOT_NICK_HERE.*)" "chat $1"
```
^^ replace BOT_NICK_HERE with your bot nick and add automatic replies to nick mentions
