In an effort to keep track of how often memory is getting heap allocated, I am implementing constructors for IceResult and BreadcrumbTreeElement. This should limit the places that I call Rc::new and allow me to place tracing code into it later to ensure all code paths doing heap allocation make sense.
I believe this change will remove an extra heap allocation I was doing in the new_breadcrumbs_* functions for the explicit context by adding support for converting from Rc<dyn ContextElement> to Rc<dyn IntoContextElement> without copying the underlying data. This should allow conversion of the IceResult::Owned variant to the BreadcrumbTreeElement::Owned variant without extra copying.
Since I'm changing a pretty core concept of the renderer, I'm going to be rebuilding it piece by piece. In the interest of being able to rapidly change things and check if they are valid through compilation, I need to eliminate most of the old code so I do not have that weighing me down.
Before I was relying on Loopable to both determine truthiness and get a list of elements to loop over. This will no longer work since I need to only set $idx and $len when iterating over actual arrays, as opposed to all truthy values, so I've finally made truthiness explicit.
Need to see if I can do a generic implemented of IntoBoxedContextElement for all objects implementing Copy, and I need to implement the compare code to make sure this all works before I start integrating this more.
