feat: show monster immunity in description

[scarf005]

Summary

SUMMARY: Interface "Show monster immunity in extended description"

Purpose of change

expose more info to players, in this PR, immunity

Describe the solution

• reused describe_flags lambda

Cataclysm-BN/src/damage.h

Line 23 in b545f49

DT_BIOLOGICAL, // internal damage, like from smoke or poison

• made it render as 'posion' and 'smoke' despite being a single m_flag (MF_BIOPROOF), because i couldn't figure out a better way

Describe alternatives you've considered

name its immunity biohazard

Testing

1. spawn a zombie, zombie firefighter, zombie master, and prototype robot.
2. e(x)amine then read (e)xtended description
3. its immunity is shown.

Additional context

• which would be better? biohazard or smoke + poison?
• should we split this damage type into two?
• are there smoke or poison damage type?

[chaosvolt]

1. Compiled and load-tested.
2. Spawned in a mundane zombie, checked its description.
   
   mon_zombie does not have any of the relevant flags, so this is clearly incorrect.

[scarf005]

ah, hecc. not sure why that happens, will investigate later.

[chaosvolt]

Also checked a monster that actually has an immunity, firefighter zed has acidproof and still shows all immunities, so it's not a simple case of the logic being installed backwards it seems...

[scarf005]

well, should've used describe_flags over describe_properties.

[chaosvolt]

1. Compiled and load-tested.
2. Spawned in and examine several critters.
3. Basic zombies correctly don't even show the immunity line.
4. Firefighter zeds show immunity to acid.
5. Zombie masters show bio immunity.
6. Robots show immunity to cold and bio-hazard.