Method TryGet
TryGet(string, out Loadable<Object>)
Linear lookup. Deliberately not a dictionary yet: the call sites are per-acquire, not per-frame, and a
cache would have to be invalidated when a mod registers another directory (a later registration wins,
because ContentLoadManager searches directories in reverse registration order). Build the index
once the call pattern is known.
public bool TryGet(string key, out Loadable<Object> asset)