[Dev] Persistence mechanisms

[mttaggart]

Come up with a way (ways?!) to persist the agent.

[HuskyHacks]

• Registry Run key
• Startup Folder
• WMI event subscription
• COM Hijacking
• XLL subscription (https://github.com/jfmaes/Emulation-Workshop/blob/main/HelloFromXll/dllmain.cpp)

[mttaggart]

• Linux .bashrc
• Linux cron

Implemented in f81affc

[mttaggart]

• Linux systemd
  Implemented in 4a40453

[HuskyHacks]

• Windows persist schtasks

[HuskyHacks]

Moving all remaining persistence mechanisms for next release, closing this issue and will reopen issue for next release