Reject constructor in constructor slot inventories (#505)

coil

2019-07-21 bb05ff8fd210fc9fac0b521f15e755380e6916d3

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default
pipeworks
technic_worldgen
basic_materials
bucket?
screwdriver?
mesecons?
mesecons_mvps?
digilines?
digiline_remote?
intllib?
unified_inventory?
vector_extras?
dye?