• Improved support for C++ in Module::Build::FFI
  
• Module::Build::FFI can now be subclassed to support foreign
  languages other than C and C++. See Module::Build::FFI::Rust as an
  example.
  
• Added a hook to allow different names for native types. See
  FFI::Platypus::Lang::Rust for an example.
  
• Added a hook to allow mangling of symbol (function) names. See
  FFI::Platypus::Lang::CPP for an example with C++
  
• Module::Build::FFI#ffi_include_dir can now be an array reference
  
• Module::Build::FFI#ffi_source_dir can now be an array reference
  
• Module::Build::FFI#ffi_libtest_dir can now be an array reference
  
• Module::Build::FFI will build assembly source files (with .s
  extensions) in the libtest and ffi directories