Switch default mangling back to cpp #25338
Description
Summary
#25264 introduced a switch for name mangling - however, it should default to C++ since this provides a much better developer experience.
Description
C++ name mangling provides a significantly better developer experience since it integrates with GDB, vtune, valgrind etc - libbacktrace has now been updated to support it as well, meaning that efficient backtraces also show demangled names.
The default has been C++ for a number of versions now meaning that build systems and users have come to expect C++ names - as such, it would be nice to switch the default back to cpp.
Further out, libbacktrace-nim will learn to demangle the Nim name to "nim style" instead of the "C++ style" that it uses now - this will allow fully round-tripping nim names in the backtrace providing familiar Nim syntax.
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Backwards Compatibility
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