so-5.3.0: New run_so_environment() variants

The two new form of so_5::api::run_so_environment() routines introduced. One of them receives lambda or std::function object as initialization function. It allows to write like this:

int
main( int argc, char ** argv )
{
  try
  {
    so_5::api::run_so_environment(
        [argc, argv]( so_5::rt::so_environment_t & env ) {
          const int meetings = 2 == argc ? std::atoi( argv[1] ) : 10;
          init( env, meetings );
        },
        std::move(
            so_5::rt::so_environment_params_t()
                .add_named_dispatcher(
                    "active_obj",
                    so_5::disp::active_obj::create_disp() ) ) );
  }
  catch( const std::exception & ex )
  {
    std::cerr << "Error: " << ex.what() << std::endl;
    return 1;
  }

  return 0;
}

The another allows to edit semiprepared so_5::rt::so_environment_params_t object by function (or lambda, or std::function object):

int
main( int argc, char ** argv )
  {
    try
      {
        so_5::api::run_so_environment(
          //
          // This is a lambda for starting actions. 
          //
          [argc, argv]( so_5::rt::so_environment_t & env ) {
            const std::size_t ITERATIONS = 2 == argc ?
                static_cast< std::size_t >(std::atoi( argv[1] )) :
                10u;
            auto coop = env.create_coop(
                so_5::rt::nonempty_name_t( "test_coop" ),
                so_5::disp::active_obj::create_disp_binder(
                    "active_obj" ) );

            coop->add_agent( new a_runner_t( env, ITERATIONS ) );

            env.register_coop( std::move( coop ) );
          },
          //
          // This is a lambda for tuning SO Environment parameters.
          //
          []( so_5::rt::so_environment_params_t & p ) {
            p.add_named_dispatcher(
              "active_obj",
              so_5::disp::active_obj::create_disp() );
            p.exception_reaction(
              so_5::rt::shutdown_sobjectizer_on_exception );
          } );
      }
    catch( const std::exception & ex )
      {
        std::cerr << "Error: " << ex.what() << std::endl;
        return 1;
      }

    return 0;
  }