Feature Request: Option to escape curly brackets in codeblocks

[georgeedwards]

As discussed here, if a code block contains { or }, it can cause issues with front end frameworks. It would be really useful to set an option to auto-escape brackets in the code block. i.e.

```
    @import { url('~/platform.css') };
```

=>

<code>
{{'@import { url(&#39;~/platform.css&#39;) };'}}
</code>

[georgeedwards]

Possibly a better approach would be to parse and curly brackets in code blocks as { and }?

[joshbruce]

#983