PTZ control via PS4 Controller integrated into UI

[iingram]

For Cyclops project, the intent is that the user will be able to, during deployment, aim the PTZ camera using the PS4 Controller. This has yet to be fully implemented. All the basic building blocks (starting/stopping control from the PS4 Controller, the mapping of the controller to PTZ movement and things like that), however, have been written and validated. But we do need to think about where these pieces are built into the dencam code architecture. At this stage, the presumption is that the mechanics will be implemented/used in recorder_ptz.py so that all the other logic are largely unaware of the additional feature.