Add 'htmlentities' argument to get_the_block() and the_block

- Used when you do not want to apply filters and do not want to apply htmlentities().
- Ignored when apply_filters is true.
- Also wrapped apply_filters with the check that $meta has a value.
- Warning: This bypasses any XSS protection.

```php
get_the_block('Name of Block', array('apply_filters' => false, 'htmentities' => false);
```

Returns

```
<h1>Hello</h1>
```

Instead of

```
&lt;h1&gt;Hello&lt;/h1&gt;
```