Attenuated forcefields

Attenuated forcefields are a downsized version of the forcefield generators, used to protect the smaller Scrin "vehicles". When upgraded from the nerve center, it grants their gun walker, shard walker and Seeker an extra layer of protection. While active, the forcefield can absorb an EMP blast before collapsing, allowing these units to remain active.

Changelog

 * Kane's Wrath patch 1.01: cost normalized across all Scrin factions
 * Kane's Wrath patch 1.02: build time reduced to 60 sec