Refactor `DirectoryContainer` in a Way that Allows the Container to be Used for Other Items

The `DirectoryContainer` `struct` / `impl` should have a generalized version of it refactored out. This would be a new `struct` / `impl` block that is simply a container that accepts a name and a vector of items. The `DirectoryContainer` class would then use this new class and then this new class could also be used to display the metadata of a file.