Fix target check for tomlplusplus in CMakeLists

[HaydnTrigg]

The check for the tomlplusplus target uses the wrong target name, so an externally provided tomlplusplus target is never detected and CMake always falls back to find_package.

It needs to use the same target name that is referenced in the adjacent target_link_libraries.

[gemini-code-assist]

Summary of Changes

Hello @HaydnTrigg, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a subtle but important issue in the CMake build configuration where the tomlplusplus target was not being correctly identified when provided externally. By aligning the target check with the fully qualified target name used for linking, the build system will now properly recognize existing tomlplusplus installations, streamlining the build process and avoiding redundant package searches.

Highlights

• CMake Target Detection Fix: Corrected the target name used in the if (NOT TARGET ...) check for tomlplusplus within CMakeLists.txt to tomlplusplus::tomlplusplus.
• Improved External Library Handling: This change ensures that an externally provided tomlplusplus target is now correctly detected by CMake, preventing it from unnecessarily falling back to find_package.

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[gemini-code-assist]

Code Review

This pull request updates the CMakeLists.txt file to change how the tomlplusplus target is checked. Specifically, it modifies the if (NOT TARGET ...) condition from tomlplusplus to tomlplusplus::tomlplusplus, aligning the target check with the modern namespaced target usage for linking the library.