Refactored conveyor filter variables:
Added a new field called Buffer that acts like the old Minimum system (transfer blocks of X items)
Minimum field will now transfer everything over the given value in the input container (eg. a minimum of 10 wood will transfer all wood until there is 10 left and then stop)
In a case where the Buffer and Minimum fields are both used, you will need the combination of both values to start a transfer (eg. a minimum of 10 and a buffer of 15 will need 25 before trhe transfer will begin)