Happy St Patrick's Day!

-Adds corned beef and cabbage
-Adds green beer

-Removes some old commented-out code
-Reorganizes food.dmi. PLEASE KEEP ANY FUTURE SPRITE ADDITIONS TO THIS FILE ORGANIZED OR I WILL CRY.
-Ghostburgers and Booberry Muffins now use Alpha var instead of different sprites.
Too many donuts
Merge pull request #3104 from Cheridan/stpatties

Happy St Patrick's Day!