Support PHP 8.4 (#15)

Add `getFullPageHtml()` (#14)

`getFullPageHtml()` doesn't remove HEAD & BODY and preserve inline styles while still sanitizing what it's supposed to be sanitized.

Can configure the sanitizer as a standalone object to sanitize arbitr…

…ary strings too (#12)

For example:

```php
$sanitizer = new SensitiveValueSanitizer();
$sanitizer->addSanitization('🍍', '🍌');
$string = $sanitizer->sanitize('🍍🍕');

// [...]

$phpInfo = new PhpInfo($sanitizer);
$html = $phpInfo->getHtml();
```

Merge pull request #11 from spaze/spaze/eol-phps

Support PHP 7.4 too

Merge pull request #10 from spaze/spaze/phpinfo-css

Update `phpinfo()` CSS to match PHP 8.3

Merge pull request #9 from spaze/spaze/numeric-session-ids

Support pure numerical session ids in sanitization

Merge pull request #7 from spaze/spaze/php-8.3

Support PHP 8.3

Merge pull request #5 from spaze/spaze/php-8.2-tests

Start testing on PHP 8.2

Merge pull request #1 from spaze/spaze/php8

Support PHP 8

Initial commit

Code taken from https://github.com/spaze/michalspacek.cz/blob/e8cf6bd7a750ee8ec5aadb5d3ba9f04bac5264c0/site/app/modules/Admin/presenters/InfoPresenter.php