The logic that prevents mechanically wearing a tool was also preventing
the diminution of a stack of items to use, such as a stack of snowballs.
Restrict the use of pickcopy to the case where the stack still has the
same item type, count, and metadata.
Due to historical shenanigans around the addition of the pick slot to
node breakers, some breakers that were placed before the addition have
ended up with a mese pick in their newly-acquired pick slot, rather than
in the ghost_pick slot where it belongs. This causes these breakers to
spill this ghost pick when they are broken. To avoid this, make pick
spilling conditional on the breaker having a formspec: pre-slot breakers
don't have one.
Also phase out "old new" API, leaving only the "tube_connects={}" method,
as nothing in technic or pipeworks uses it.
Fix a few more places where minetest.facedir_to_dir() was duplicated, since
that code is part of Minetest 0.4.8.
autocrafter, nodebreaker, deployer, and made sure each item will only
initiate a connection to those sides which can accept such. Fixed
various autorouting bugs as I ran across them. Autorouting for various
devices is now:
filters: left and right sides only
nodebreaker, deployer: back only
autocrafter: all six sides
chests: top, bottom, left, right, back (not front)
furnace: bottom, left, right, back (not the top or front)
