Fixed input & output sides for imprinter

Only a armbot can do auto crafting since no side can access the output
slot. This is by design to prevent pipe or manipulator crafting. I will
add bonus later to the crafting arm to get people to want to use this
system. e.g. Blue prints that don't use some items, or use less items.

All sides will connect to the internal inv. Crafting and imprinter slots
have not automated use so no access is given. I might change this later
but you should only need to mess with the inv slots.