Bug Fixes
* fixed issue with state ()
* frame rate processing for real time ()
* get_sub_environments() is always empty for inference client ()
* handle case when there's no info dict ()
* moved obs data to info dict ()
* revert changes to callbacks; now handling this issue in the inference experiment class ()
* Update multi_agent_env.py ()
* Update multi_agent_env.py - removed useless return ()
* updated custom policy to use info dict ()
* use sim_time from state, not sim ()