Fix #82, use separate dispatcher for messages

[jphickey]

Checklist (Please check before submitting)

• [x] I reviewed the Contributing Guide.
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Describe the contribution Isolate the message verification and dispatch from the general message processing. Functions in the "cmds" file now strictly handle the command content, and do not get involved in general validation.

Fixes #82

Testing performed Build and run CFE with LC, sanity check operation

Expected behavior changes No impact, just improves source unit organization

System(s) tested on Debian

Contributor Info - All information REQUIRED for consideration of pull request Joseph Hickey, Vantage Systems, Inc.

[jphickey]

Format checks fixed, all passing now.