BPhysTools: Fix cppcheck warnings.
Pass strings by const reference, not by value. Use a union to see a value as a different type, not pointer casts. Suppress warnings from boost::format. (Should change this to C++20 format once that's available.)
Pass strings by const reference, not by value. Use a union to see a value as a different type, not pointer casts. Suppress warnings from boost::format. (Should change this to C++20 format once that's available.)