Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I reviewed the CF README.md file to see if the feature is in the major future work.
• I performed a cursory search to see if the feature request is relevant, not redundant, nor in conflict with other tickets.

Is your feature request related to a problem? Please describe.
dword and hword are not used in the CF_UnionArgs_Payload_t union, only byte:

Describe the solution you'd like
Remove unnecessary union

Describe alternatives you've considered
CF_UnionArgsCmd_t is somewhat out of family in that it specifies unnecessary payload elements for some of the commands. The only common benefit seems to be byte 0 which is channel, supporting all channels generically with 255. Consider untangling all the layers of abstraction and go back to simple command processing.

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC