TODO:
/**
* @param {array} $params
* $params['show'] What to show (e.g. category, related, tag, all)
* $params['name'] Name of the part (e.g. content-main.html)
* $params['assign_to'] Variable withing the template engine to which the content has to be assinged.
*
*
* # EXAMPLE 1
*
* {posts assign_to="posts"}
* {posts show="all" assign_to="posts"}
*
*
*
* # EXAMPLE 2
*
* {posts show="category" name="news" assign_to="posts"}
*
*
* # EXAMPLE 3
*
* {posts show="related" size="3" post_id="{$post.ID}" assign_to="related"}
*
*
* # EXAMPLE 4
*
* {posts show="tag" name="news" assign_to="tags"}
*
*
*/