change name mtx_msg for m_print, malloc mutex instead of equal NULL, malloc id with pthread_t instead of int, and change name some functions

headers/philo_struct.h

@@ -17,7 +17,7 @@ typedef struct s_philo
 	t_params		*params;
 	int				philo_nbr;
 	int				fork;
-	t_mtx			*msg_mtx;
+	t_mtx			*m_print;
 	struct s_philo	*prev;
 	struct s_philo	*next;
 }					t_philo;