Attempt to place stack node directly when player is pointing at
a node space, instead of tossing out an item ent.
This makes item organization less tedious in the early game, as
players are manipulating node positions instead of calculating
ent ballistics in their heads when trying to lay out inventories
on the ground, or using naive shelving.
(Note that wooden shelves still have an advantage in how quickly
items can be taken from them).
Items are still tossed as ents if a player is not looking at a
valid place in nodespace, so inventories can still be e.g. thrown
over a cliff or jettisoned in the ocean...
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