********************************************************************
Register handlebars partials.
function() {
    var help = handlebars.Utils.escapeExpression(this._service.getUsage())
    handlebars.registerPartial('ServiceHelp', `
<pre>
${help}
</pre>
`)
    handlebars.registerPartial('schemaElements',
`{{#each children}}
+ **{{name}}**{{#if_nea '*(either)*,*(or)*' name}}{{#falsey required}} *(optional)*{{/falsey}}{{~/if_nea}}:
{{#truthy description}}{{description}}{{/truthy}}
{{#ifnotempty children}}
    {{> schemaElements}}
{{/ifnotempty}}
{{/each}}`
    )
  }