Added food saturation multiplier

I noticed that after HO applies its tweaks, the amount of saturation restored relative to hunger is lower than it is in vanilla. I added a float multiplier that defaults to 1.0 (unchanged), and it modifies just the saturation value of the food event. Getting a food saturation level similar to vanilla is somewhere between 1.2 and 1.4, depending on how you feel about feasts giving over 20 saturation (cooked beef gives 20.8 in vanilla).