adjust X in repeat modes like 'X per person' only by -1/+1 (#5)

* adjust X in repeat modes like 'X per person' only by -1/+1

For bills like 'make go-juice x4' and repeat mode 'Do until X', the -/+
buttons change X by -4/+4. That at least somewhat makes sense, given
that 4 items are produced, but one click of + going from '1 per person'
to '5 per person' is silly.
- llunak

Add some null checks to OrphanBills

Fixed a typo in the log message

Filters are no longer cleared or broken when changing maps

Fixed Better Workbench Management support (#1)

Pipeline online ^.^

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