Fix #1021, pool buffer type

[jphickey]

Describe the contribution

Use a generic void* as the interface type for the pool buffer pointers. This reduces the need for local type casting in the apps and makes it generally easier to use.

Fixes #1021

Testing performed
Build and sanity test CFE
Run all unit tests

Expected behavior changes
No impact to behavior.

System(s) tested on
Ubuntu 20.04

Additional context
Note that getting a buffer in one step still requires a type cast, as the interface here is really void**. However when putting or querying a buffer no cast is needed. One can also avoid the need to cast if they get a buffer in two steps (i.e. get as void* first, then convert to real type with a simple assignment.

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

[jphickey]

Real commit is in 3e347e5, need to get a new baseline first to avoid conflicts.

This can be reviewed but it will need a rebase before final merging.

[astrogeco]

CCB 2020-11-18 APPROVED

• @jphickey to rebase so we can include it in this merge cycle

[jphickey]

Rebased and ready to go.

[astrogeco]

CCB 2020-12-02 Minor Cleanup