Expand on Instance.OnPlayerDamage by adding hitgroups and armor dmg

[girlglock]

id love to see hitgroups back in Instance.OnPlayerDamage along splitting HP and Armor damage. this would cut down on unnecessary calculations being needed by getting weapon data and doing the math.
the player_hurt game event carried these in the output

OnPlayerDamage(callback: (event: {
    player: CSPlayerPawn,
    damage: number, //absolute damage
    hp_damage: number, //damage done to health
    armor_damage: number, //damage done to armor
    hp_left: number,
    armor_left: number,
    inflictor?: Entity,
    attacker?: Entity,
    weapon?: CSWeaponBase,
    hitgroup?: HitGroup
}) => void): void;

export enum HitGroup {
    Generic = 0,
    Head = 1,
    Chest = 2,
    Stomach = 3,
    LeftArm = 4,
    RightArm = 5,
    LeftLeg = 6,
    RightLeg = 7,
    Neck = 8,
    Unused = 9,
    Gear = 10,
    Special = 11,
    Invalid = 4294967295
}