IC:Caelum-rc4+dev11: cFE v7.0.0-rc4+dev143

- Endian macro mask before shift to avoid shift overflow warning
- Add macro for initializing command header
- Add CFE_ES_StatusToString and CFE_STATUS_C
- See <nasa/cFS#505>

Merge pull request nasa#2074 from nasa/integration-candidate

cFE Integration candidate: Caelum-rc4+dev7

Merge pull request nasa#1967 from nasa/integration-candidate

cFE Integration candidate: 2021-09-21

Merge pull request nasa#1915 from thnkslprpt/FIX-CFE-TYPOS

Fix nasa#1946, Correct typos in docs, comments and error messages.

Part of nasa/cFS#352

Merge pull request nasa#1839 from nasa/integration-candidate

cFE Integration candidate: 2021-08-24

Merge pull request nasa#1279 from nasa/integration-candidate

cFE Integration candidate: 2021-04-02

cFE development snapshot (cFS-Caelum) before directory refactor in na…

…sa#1203

This is a midpoint for users not ready to move to the new cFE directory structure.

Bump to v6.7.0+dev298 and update ReadMe

Release Candidate 1 for cFE v6.8.0, part of the upcoming cFS-Bootes r…

…elease.

Fix README.md formatting