CMake Updates + GCC 11 warnings fix + removed timemory

What's Changed

• Fix C++20 warnings from GCC 11.2.0 by @amadio in #15
• Removed timemory by @jrmadsen in #18
• Springclean CMake scripts and developer/client build/use interfaces by @drbenmorgan in #13

New Contributors

• @amadio made their first contribution in #15
• @drbenmorgan made their first contribution in #13

Full Changelog: v2.0.0...v2.1.0