Fix #199, Use `CFE_MSG_PTR` instead of `&(x).Msg`

[thnkslprpt]

Checklist

• [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

• Fixes #199
  • Local unwrappings replaced with the abstracted CFE_MSG_PTR macro

Testing performed GitHub CI actions all passing successfully (incl. Build + Run, Unit/Functional Tests etc.).

Expected behavior changes No change.

System(s) tested on Debian GNU/Linux 11 (bullseye) Current main branch of cFS bundle.

Contributor Info Avi Weiss   @thnkslprpt

[thnkslprpt]

Thanks for doing this! I was about to do this myself, but then noticed the PR.

Only thing is that it needs a rebase, tlm_header is now TelemetryHeader ... etc.

Cool no worries Joe @jphickey. Rebased etc. and seems fine now. Cheers