New map transformation, composite function wrapping example, and various refactoring of internal methods

• Added map transformation for converting arrays into map types
• Added support for automatted wrapping of C++ model functions that have arguments with types of std::string, std::vector, or std::map.
• Added composite_function example of wrapping multiple inputs of different types to a function as separate channels and composite_function2 example
  of wrapping multiple inputs & outputs to a function as single channels
• Added 'count' FileComm parameter to specify the number of times a file should be read
• Refactor geometry serialization classes to use rapidjson methods
• Refactor how additional variables created during function wrapping are handled
• Updated C++ interface to use updated rapidjson that requires allocators for yggdrasil types
• Allow use of with_asan with CMake/Make models