Added missing Base Process Functor file/class

#ifndef ISISIMPORT_BASE_PROCESS_FUNCTOR_H

#define ISISIMPORT_BASE_PROCESS_FUNCTOR_H

namespace Isis {

  class ProcessFunctor {

    public:

      /**

       * Constructs a processFunctor

       *

       */

      ProcessFunctor() {}

      virtual ~ProcessFunctor() {}

      void operator()(Buffer &buf) const {};

  };

}

#endif