redstone emulator fix

craft cache fix

faster text render string, changed length limit

self.operations() displays remaining available operations for robot

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

redo of code preprocessing

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

new scripts

new demo scripts

enigma

fire action fix
new scripts

craft: several crafts at once

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