Changing edible mushrooms to viFilling = 5

After some feedback, I decided that changing viFilling to 5 would still allow new players to sustain their vigor, allowing them to eat up to 20 edible mushrooms and reaching 180 vigor in that way. This preserves the current niche for cheese as being slightly less nutritious but lighter to carry and easily bought from vendors. Inkies remain miles ahead in every aspect, as they have always been.