First attempt at a section render function.

Running into an issue with generics vs dynamic references.

src/renderer/context_element.rs

@@ -22,7 +22,5 @@ pub trait Loopable {
     /// once with the context being the element at that path. Finally,
     /// if its an array-like value then it will render n-times, once
     /// for each element of the array.
-    ///
-    /// TODO: Should this return an iterator instead of a vec?
     fn get_loop_elements(&self) -> Result<Vec<&dyn ContextElement>, RenderError>;
 }