Adds cockroaches

Created by: unid15

My other 2 prs will never get finished edition

(the spammy messages have been removed)

• These creatures from hell crawl on walls and food, and also hide under trash. They can lay eggs under food (and, since their eggs count as food, this means they'll create large nests with dozens of eggs)
• Killing them leaves a mess
• Spraying them with toxin will kill them without leaving a mess (only a small roach body)
• They can fly when threatened, gaining speed
• They survive in any environment as long as the temperature is above 0C, and can crawl over computers, grilles and tables. They also survive explosions and nukes
• The infestation event can spawn up to 30 of these disasters

OTHER CHANGES

• Acid smoke and acid sprays will now slightly damage simple animals
• Tiny animals (mice, roaches, lizards) no longer produce gibs when butchered