Fix #19, Use CFE_MSG_PTR macro and other name updates

[jphickey]

Checklist (Please check before submitting)

• [x] I reviewed the Contributing Guide.
• [x] I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution Follow naming conventions for cmd/tlm data structures and use provided macros where appropriate.

Fixes #19

Testing performed Build and sanity check LC, run all tests

Expected behavior changes None

System(s) tested on Debian

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

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