Handlebars support

[Glavin001]

See anaptfox/atom-beautifier#4

In progress 😄..

[Glavin001]

See tests at https://github.com/beautify-web/js-beautify/blob/ae86bf6bd9b4a1a069f9cbe19502242d39516b21/js/test/beautify-tests.js#L1776-L1910

[Glavin001]

• Defaults to enabled when current grammar is Handlebars
  Enabled being:

    defaultOptions.indent_handlebars = true; // jshint ignore: line

[Glavin001]

Working!

Before:

{{#if}}
{{#each}}
{{#if}}
content
{{/if}}
{{#if}}
content
{{/if}}
{{/each}}
{{/if}}

After:

{{#if}}
  {{#each}}
    {{#if}}
      content
    {{/if}}
    {{#if}}
      content
    {{/if}}
  {{/each}}
{{/if}}

[julkue]

Still not working correctly for me. Assuming you have the following (correctly formatted code):

{{> header}}

<div class="container">
    <div class="row">
        <main class="col-xs-12">
            {{{contents}}}
        </main>
    </div>
</div>

{{> footer}}

It will be formatted to:

{{> header}}
    <div class="container">
        <div class="row">
            <main class="col-xs-12">
                {{{contents}}}
            </main>
        </div>
    </div>
    {{> footer}}