First pass on a shopkeeper NPC in the water well (only on D variant right now)
Can be killed by players, will not drop any loot
Will respawn after 30-60 minutes
Shop is inaccessible while the shopkeeper is dead (so please be nice)
Some minor shopkeeper cleanup, converted a generic flag into a named const flag for better tracking and invisible vending machines no longer need to do a Vis.Entities every time they sell something or look at the player