Changing edible mushrooms to viFilling = 3

This change would allow new players to keep up their vigor by eating the mushrooms they find while fighting. Edibles still wouldn't be viable for built characters, since they weigh 7.5 times as much as inkies per vigor restored. The Nutrition/Filling ratio would remain worse than inkies as well. (edibles:1.67, inkies:2)
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.
Merge pull request #22 from MorbusM59/patch-1

Allows players to eat up to 20 edible mushrooms on an empty stomach, allowing them to reach 180 vigor from 80.