Quiet option fix

[hellkite500]

Fixes #375 by including compile definitions for ET_QUIET and NGEN_QUIET, as well as ensuring these are set before the various subdirectory builds are added.

Additions

• Compile definitions in CMakeLists.txt for ET_QUIET and NGEN_QUIET

Changes

• Add compiler definitions before calls to add_subdirectory in CMakeLists.txt

Testing

1. Build tested for QUIET operations using cmake 3.17.5

Checklist

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

Target Environment support

• Linux
• MacOs

[mattw-nws]

Quite remarkable, I must say.