Mimics update part 2

Created by: unid15

• Mimics' choice of disguise is now affected by area they're in
• Item mimics no longer get angry when stepped on
• Mimics will eventually get angry when getting pulled

(pictured: item and crate mimics in medbay, general hallway, bar, area with a fire alarm)

• Attacking a chest mimic with a sharp object has a 20% chance of severing its tongue, preventing any further grab attacks
• Item mimics have 60 health (down from 80)
• Mimic regeneration is no longer instant
• When at low health, item mimics disguise themselves as a bullet casing, a cigarette butt or a blink toy
• Once item mimics fully regenerate, they transform back into their usual form (unless somebody's looking at them)