Replace old macros with consistent NGEN_WITH_FOO

[PhilMiller]

Replace all NGen-specific build condition macros that weren't in the current standard form in the codebase with the standard form.

Resolves #813

Testing

1. Local testing with various flags enabled/disabled
2. CI

Checklist

• [x] PR has an informative and human-readable title
• [x] Changes are limited to a single goal (no scope creep)
• [x] Code can be automatically merged (no conflicts)
• [x] Code follows project standards (link if applicable)
• [x] Passes all existing automated tests
• [x] Any change in functionality is tested
• [x] New functions are documented (with a description, list of inputs, and expected output)
• [x] Placeholder code is flagged / future todos are captured in comments
• [x] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• [x] Reviewers requested with the Reviewers tool :arrow_right:

[PhilMiller]

Grrr, builds failing due to include paths for much of the codebase not reaching NGenConfig.h. Gotta play with CMake more to figure that out.