* Make the library modular usable.
* Add missing import-search for cconfig/predef checks.
* Add requires-b2 check to top-level build file.
* Bump B2 require to 5.2
* Remove boost-root target refs.
* Change all <source> references to <library>.
* Update copyright dates.
* Fix library global (relative) references.
* Move inter-lib dependencies to a project variable and into the build targets.
* Add Boost.StaticAssert transitive dep module.
* Only test on latest macOS.
* Add Boost.ThrowExceptions transitive dep module.
* Add Boost.Preprocessor transitive dep module.
* Change MacOS Clang std version to 20 from 2a
* Disable ranges on MacOS.
Remove CUDA testing - I just can't get CUDA to install any more.
* Update drone checkouts.
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Co-authored-by: Rene Rivera <grafikrobot@gmail.com>
