Resolve Tech Lab / Reactor situation

[StoicLoofah]

So in build orders, it's really helpful to have things marked as "Barracks Reactor" and "Starport Reactor", but in units lost, it's just "Reactor" or "Tech Lab". There's not a problem with this explicitly at the moment, and the data is all clear, but if the build order and the units lost ever get mashed up, we probably need to drop back to the units in sc2reader instead of labels in spawningtool.