Added a FoodStats.java.patch.

A patch for the FoodStats class which adds a maxFoodLevel so modders can set the maxFoodLevel for more food.

Things changed:
Added a private int maxFoodLevel, (and a getter and setter).
Changed the needsFood method (func_75121_c) which makes it respect the maxFoodLevel.
Changed the addStats method (func_75122_a) which also makes it respect the maxFoodLevel.