Added worker job district for the Craftworld, scaling with deposits.
Added back slavager job in Drukhari world, for slaves only.
Changed district art.
Added names for district specialization.
Added starting slaves for Drukhari start.
Big re balance of bonuses, nerfed pretty hard. Stuff that was fine in 3.14 interacted multiplicatively with 4.0 stuff and became ridiculous.

Fix zone per-district modifiers.

Updated for 4.0.16.

Fixed genetic ascension increasing housing usage instead of decreasing.
Housing districts give more housing now.
Webway gate travel is instant now. That helps the pathfinding a bit.