settings: Cleanup

Addresses review feedback

Co-authored-by: Morph <39850852+Morph1984@users.noreply.github.com>

src/common/CMakeLists.txt

@@ -205,6 +205,7 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     -Werror=unreachable-code-aggressive
   )
   target_compile_definitions(common PRIVATE
+    # Clang 14 and earlier have errors when explicitly instantiating Settings::Setting
     $<$<VERSION_LESS:$<CXX_COMPILER_VERSION>,15>:CANNOT_EXPLICITLY_INSTANTIATE>
   )
 endif()