inventory.item_active removed in 0.15

[DaveMcW]

inventory.item_active was removed, you need to use book.active_index to look up look up the item slot now.

Steps to reproduce:

1. Insert a blueprint book into a blueprint deployer
2. Connect a constant combinator with construction-robot = 2000

Result:
Error while running event recursive-blueprints::on_tick (ID 0)
recursive-blueprints/deployer.lua:23: attempt to index local 'bookActiveInv' (a nil value)

[justarandomgeek]

recursive-blueprints is abandoned in favor of ConMan, I merely made a 0.15 build for someone who asked for it to load an old save file. Anyone who would like to adopt it is welcome to.