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Added pressure plates

- Copper: Detects non-monster creatures (like pigs, wolves and parrots, both tamed and untamed)

- Zinc: Detects non-living entities like armor stands, items, boats and minecarts

- Brass: Detects item entities only

All pressure plates are counting, giving a signal strength according to the amount of entities on them.

Added a buffer of 1 stack to the rolling machine. This can be accessed from belt inserting only.

Fixed the checked belt sometimes being offset by one (hopefully. In my testing it worked, but it might still be reproduceable)

This is the first version i tested actually on server, all seems to work fine.