NEW YORK — Cartoonists across the nation are celebrating the 100th birthday of “Peanuts” creator Charles M. Schulz as only they can — with cartoons. More than 75 syndicated cartoonists have tucked tributes, Easter eggs and references to “Peanuts” in Saturday’s funny papers to honor the creator of Charlie Brown, Snoopy and company. “It’s a tribute to probably the world’s …