Implement with semaphores for project 4

[khashf]

Current solution is done by putting #pragma omp barrier directives inside corresponding function of each threads

#pragma omp parallel sections default(none) shared(NowGrainHeight, NowNumDeer)
        {
            #pragma omp section
            {
                Grain();            
            }
            #pragma omp section
            {
                Deer();
            }
            #pragma omp section
            {
                Watcher();
            }
        } // omp parallel sections

When have time, try to solve with semaphores.
CS475 instructor, Matthew Meyn, confirmed that this can be done with semaphores.