BIO_IMMUNE is missing a JSON flag definition and errors if defined in the game

[RoyalFox2140]

Describe the bug

Whenever @scarf005 did https://github.com/cataclysmbnteam/Cataclysm-BN/pull/3225 we needed a flag for monsters to be immune to biological damage it wasn't realized by any involved parties that BIO_IMMUNE exists in character.cpp but doesn't have a json flag definition so it errors out on usage. This seems like a minor fix but it's also fairly confusing that character and monster has separate flag names for the same effect. I think ideally we would migrate all damage immunity flags to be named the same, but for now we need a flag definition for BIO_IMMUNE.

I'm leaving a note here that refactoring all of the immunity flags in character.cpp is most ideal to avoid confusion about using the wrong flag.

Steps To Reproduce

1. Check character.cpp for "BIO_IMMUNE"
2. Check monster.cpp for "BIOPROOF"
3. Check flags.json for "BIO_IMMUNE"

Screenshots

Versions and configuration

OS: Windows OS Version: 10.0.19045.3448 (22H2) Game Version: https://github.com/cataclysmbnteam/Cataclysm-BN/commit/ed1f287b503ccee2e01895015c1c87e5f8fcf643 [64-bit] Graphics Version: Tiles LAPI Version: 2 Game Language: English [en_US] Mods loaded: [ Bright Nights [bn], Craftable Gun Pack [craftgp], Alternative Map Key [alt_map_key], Fuji's Military Profession Pack [fuji_mpp], Craftable Bullet Casings [CasingCrafting], MST Extra [MST_Extra], Tankmod: Revived [Tankmod_Revived], Essence 2200 BN [Essence2200_BN], Essence 2200 Tweaks [FoxTweaks], Nonperishable Overhaul [Nonperishable_Overhaul], No Addictions [No_Addictions], Limit Fungal Growth [limit_fungal_growth], Disable NPC Needs [no_npc_food], Simplified Nutrition [novitamins], OMT Resources [omt_resources], Flowing Water [flowing_water], No Filthy Clothing [no_filthy_clothing], Cataclysm++ [Cata++] ]

Additional context

No response

[chaosvolt]

Weird, EFFECT_BIO_IMMUNE is properly defined for immunity from effects, just not BIO_IMMUNE for immunity from armor.