Control verbosity of debug output via build config

[robertbartel]

Note this depends on #57 and should remain in draft status until that PR is finished.

Control verbosity of debug output using CMake variable DEBUG_VERBOSITY, rather than hard coding.

Removals

• Hard-coded setting of TOPMODEL_DEBUG

Changes

• CMake build adjusted to accept a DEBUG_VERBOSITY variable and use that to set the TOPMODEL_DEBUG macro via compile definition.

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
• Visually tested in supported browsers and devices (see checklist below 👇)
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

Testing checklist

Target Environment support

• Windows
• Linux
• Browser

Accessibility

• Keyboard friendly
• Screen reader friendly

Other

• Is useable without CSS
• Is useable without JS
• Flexible from small to large screens
• No linting errors or warnings
• JavaScript tests are passing