Feature: assemble partials without rendering variables

[yespire]

h.registerPartial("p1", "p1")
h.registerPartial("p2", "p2")
let output = h.compile("partials: {{> p1}} + {{> p2}}, variables: {{v1}} + {{v2}}")()

right now, this produces "partials: p1 + p2, variables: + "

need a way to produce "partials: p1 + p2, variables: {{v1}} + {{v2}}"

proposed syntax:

h.registerPartial("header", header_tpl)
h.registerPartial("footer", footer_tpl)
var assembled_page_tpl = h.assemblePartials(page_tpl)
h.compile(assembled_page_tpl)(data)

What difference will this method make:

• right now, render-entry-point is the "content_tpl", which references the layout it use, this can become repetitive if you have a lot of pages
• with assemblePartials(), the render-entry-point is the outer page, this means sub-templates do not need to reference the parent, this is more logical

Here is an example folder structure

You can arrange a convention based template assembling logic in your project, which also support specific folder layout/partials to override the general layout/partials, in the above folder structure, legal/terms + privacy will use the following without specifying layout in template:

@sub/page
@sub/body
legal/@sub/header
legal/@sub/footer