Make a way for systems to be interdependent

[alikindsys]

Use case : Lets suppose you made a Database as an ISystem and later use said database connection on a IClientSystem
On the case of said connection not being established the ClientSystem would return an error. Its possible for that to be implemented by the user but that could be added to the SMC codebase as a cleaner api, with the usage of a [Depends] Attribute.