Fix #815, remove all deprecated code

[jphickey]

Describe the contribution
In the next major CFE release, this code will be no longer supported at all. It should be removed early in the cycle
to avoid needing to maintain this compatibility code.

Fixes #815

Testing performed
Build and run, sanity check CFE.
Run all unit tests.

Expected behavior changes
Removes code previously deprecated.
Identical to previous build if the OMIT_DEPRECATED=true flag was set during configuration.

System(s) tested on
Ubuntu 20.04
RTEMS 4.11.3

Additional context
Also depends on nasa/to_lab#55 - should be merged in same cycle.

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

[astrogeco]

CCB 2020-08-19 APPROVED. Needs more conversation about deprecation timeline and convention for cFS-Caelum

[skliper]

@astrogeco - I thought we approved this one? Further discussion required on the topic of removing elements deprecated this cycle before the release of Caelum.

[astrogeco]

@astrogeco - I thought we approved this one? Further discussion required on the topic of removing elements deprecated this cycle before the release of Caelum.

Fixed CCB comment to reflect approval.

[yammajamma]

@jphickey could you please resolve the conflicts here?

[jphickey]

Rebased. Note that this now includes several blocks with a CFE_OMIT_DEPRECATED_6_8 designation. These were also removed. But it may necessitate doing a 6.9 release of some variety.