LLNL/Abmarl

Sim unwrapped in stage doesn't work as expected

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SimManager doesn't have unwrapped property. Besides, most config files have the sim already wrapped with MultiAgentWrapper, which doesn't have its own unwrapped, it just uses the one from gym.Env, which just returns itself. Therefore, sim.unwrapped just returns the sim, which I don't think is what we intended to do.

Results from the changes made in #270

Originally posted by @rusu24edward in #454 (comment)