disconnectedCallback is not invoked

I found that `disconnectedCallback()` doesn't get invoked when removing a custom element from the DOM.

To be honest, I don't really know what behaviour should I expect here:
- diffing `document.innerHTML` when it changes, calling `disconnectedCallback`s of those elements which were removed
- having a functionality to reset/destroy a `document`, which resets `document.innerHTML` and calls the `disconnectedCallback`s of each rendered elements

Does basichtml have any support for this? (instead of doing `document.body.innerHTML = '';`)

```js
const { init, HTMLElement } = require('basichtml');
const { customElements, document } = init();

customElements.define('test-component', class TestComponent extends HTMLElement {
    connectedCallback() {
        console.log('connected');
        this.interval = setInterval(() => console.log('tick'), 1000);
    }

    disconnectedCallback() {
        console.log('disconnected');
        clearInterval(this.interval);
    }
});

document.body.innerHTML = '<body><test-component /></body>';
console.log(document.toString());
document.body.innerHTML = '';

// keeping the process alive
process.stdin.on('data', () => {});
```

As a result of not calling `disconnectedCallback`, the `setInterval()` created in `connectedCallback` keeps ticking in every second.

Console output:
```
connected
<!DOCTYPE html><html><body><body><test-component></test-component></body></body></html>
tick
tick
tick
```

(Please forgive me opening issues, there are rather questions than actual issues. I'm just getting familiar with basichtml, which looks awesome as your other projects (e.g. heresy <3))


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disconnectedCallback is not invoked #43

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disconnectedCallback is not invoked #43

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