Add Non-Item Support to Container System

[cosmiccoincidence]

Summary

The container systems need added support for non-item objects like entities and furniture.

Goal

Some furniture objects are shipped in crates and such via cargo, also you can put entities in containers like lockers, crates, etc.

[cosmiccoincidence]

Maybe should wait on container rework.

[stilnat]

@cosmiccoincidence I'm working on this one too, it'll be the second part of the container rework, can you assign me please ?