This brings back the previous sidebar_path() functionality, but I've re-implemented it as part of a more generic template_part() helper function. The helper function is aware of the main template and it will first check for partials appended with the main template name.

So if you have...

• partials/sidebar.php
• partials/sidebar-front-page.php

And you load your sidebar with App\template_part('partials/sidebar');

Then when the front-page.php template is loaded, the sidebar-front-page.php partial will also be loaded.

Additionally, this PR alters some of the language to be a little more consistent with Sage 8. Instead of "wrap" and "unwrap," I'm using "layout" (e.g., base.php) and "main" (e.g., page.php) in the Template class.