Leverage powerpick/psinject for spawn of empire agent

[johnnyDEP]

I don't know if you would be willing but adding support to spawn empire agents without powershell.exe would be epic. If you don't want to do it I could take a shot at doing a PR... let me know your thoughts.

[bluscreenofjeff]

That is a good idea! The reason it wasn't included in the initial release was due to issues with running the encoded blob with the bpowerpick function.

To get PowerPick working bidirectionally, I think the DLL Launcher in Empire is the way to go. I hope tackle this in the near future when I rework the script to support the new Empire 2.0 API. If you'd like to tackle it in the meantime, please feel free to submit a PR 👍