Fix robot being able to take pipeworks virtual item.

See merge request !1

item drops: randomize number of returned items
too long code used fix

craft: several crafts at once

fire action fix
new scripts

enigma

new demo scripts

new scripts

.. replaced with safe string.concat(table of strings, separator)

redo of code preprocessing

self.operations() displays remaining available operations for robot

tweaked operation costs for dig/move/..., total available operations per step is now 10

faster text render string, changed length limit

craft cache fix

redstone emulator fix