Boom slug balance pass

Gameplay

• Added a toggle for buildings spawned from other buildings allowing auto rebuilding

New Mutations

• Added new mutation Slug Armageddon - +2 Spawn amount,-3 Spawning Speed +15% Mass breeding chance

Balance

• Reduced Boomslug base swarm cost from 10 -> 8

• Added an additional evolution to reduce Boom Slug swarm cost.

• Added an additional evolution to increase Boom Slug speed.