Made ItemCustomFood use the standard 1.7 hunger/saturation getters
 * Improves compatibility in general, but specifically makes ItemCustomFood integrate properly with AppleCore (and therefore Hunger Overhaul/The Spice of Life)
 * See: https://github.com/squeek502/AppleCore/wiki/Integrating-food-items-with-AppleCore
Merge pull request #404 from squeek502/master

Made ItemCustomFood use the standard 1.7 hunger/saturation getters