remove ZMQ dependency

[CDKnightNASA]

Is your feature request related to a problem? Please describe.
It's unclear what ZMQ is used for and it's not a standard Python library, so requires installation. Either it should be removed or documented what the feature is that requires it.

Describe the solution you'd like
Remove dependency/requirement for ZMQ.

Describe alternatives you've considered
Document what ZMQ is required for.

Additional context
Add any other context about the feature request here.

Requester Info
Christopher.D.Knight@nasa.gov

[CDKnightNASA]

It appears that ZMQ is used for inter-process communications as each window (using Qt) is a separate process and communicating received telemetry between the windows requires a local bus to redistribute messages amongst those individual processes. There is a brief mention in Guide-GroundSystem.txt at the top as to this functionality. At this point I'll close this ticket but will continue to consider options.