Modifier escape
===============

The modifier escapes a string for safe insertion into the output.
It supports different escaping strategies depending on the template context.
By default, it uses the HTML escaping strategy:

```smarty
{$post.title|escape:'html'}
```

The modifier supports the following escaping strategies:

* html: escapes a string for the HTML body context.
* url: escapes a string for the URI or parameter contexts.
* js: escapes a string for the JavaScript context.

For convenience, the `e` modifier is defined as an alias of `escape` modifier.

Second parameter is charset.