Refactor to use new nomenclature for packages and TPLs (#63)

[bartlettroscoe]

Description

This PR almost exclusively involves the renaming of internal variables and macros/functions to make more explicit about what these are and to get ready for the final refactoring to combine logic for the handling of packages and TPLs (#63). This also changes the STDOUT for cmake that prints out the initial list of enabled/non-enabled packages and TPLs and the final list of enabled and non-enabled packages and TPLs. Therefore, this could break user code that is grepping for these lists in the STDOUT.

Notes to reviewers

• This is a very large patch as it touches a lot of lines of code and tests. Please don't review this as one huge patch!
• A good way to view the variable and function name changes in the code is to locally run git diff --word-diff-regex="[a-zA-Z0-9]+" <commit-sha1> for the individual commits that actually change large amounts of code. That will show the renamings very clearly with nice color coding.
• It is likely best to review this PR one commit at a time. The commits with huge name changes in the code can be skimmed over (as defects in those renamings are low risk since they were done with automated tools and there are tests to cover those).
• Please focus on carefully reading the updated *.rst and *.md files which are meant for humans to read.

[bartlettroscoe]

@KyleFromKitware, are you done with the review of this PR?

[KyleFromKitware]

are you done with the review of this PR?

Yes. Please fix the typo I spotted in https://github.com/TriBITSPub/TriBITS/pull/527#discussion_r973330059.