BEMHTML: Support escaped mode

[tadatuta]

In .enb/make.js for BEMHTML:

{
    engineOptions: { escapeContent: true }
}

It fails at least for doctype in page template.

[qfox]

You should check for html-entities (and replace them with utf-8 characters in common), BEMHTML.reapply & BH.apply & manually written scripts in ua block (replace with {tag: false, html: ...}). Maybe something more.