Wieldable/two-handed weapons (#4554)

* wielding kinda works

* rough out all the edges, wielding works nicely

* popups + loc

* increase damage & extra damage against whitelist

* small fixes

* forgot to actually do that

* reviews

* reviews + thing

* use resistances and not extradamageagainstwhitelist

* slashy

* make increasedamageonwield and melee hit events work with modifiersets

* Silly individual

Content.Server/Weapon/Melee/MeleeWeaponSystem.cs

@@ -88,7 +88,9 @@ namespace Content.Server.Weapon.Melee
                 {
                     var targets = new[] { target };
                     SendAnimation(comp.ClickArc, angle, args.User, owner, targets, comp.ClickAttackEffect, false);
-                    _damageableSystem.TryChangeDamage(target.Uid, comp.Damage);
+
+                    _damageableSystem.TryChangeDamage(target.Uid,
+                        DamageSpecifier.ApplyModifierSets(comp.Damage, hitEvent.ModifiersList));
                     SoundSystem.Play(Filter.Pvs(owner), comp.HitSound.GetSound(), target);
                 }
             }
@@ -153,7 +155,8 @@ namespace Content.Server.Weapon.Melee
 
                 foreach (var entity in hitEntities)
                 {
-                    _damageableSystem.TryChangeDamage(entity.Uid, comp.Damage);
+                    _damageableSystem.TryChangeDamage(entity.Uid,
+                            DamageSpecifier.ApplyModifierSets(comp.Damage, hitEvent.ModifiersList));
                 }
             }
 
@@ -274,6 +277,17 @@ namespace Content.Server.Weapon.Melee
     /// </summary>
     public class MeleeHitEvent : HandledEntityEventArgs
     {
+        /// <summary>
+        ///     Modifier sets to apply to the hit event when it's all said and done.
+        ///     This should be modified by adding a new entry to the list.
+        /// </summary>
+        public List<DamageModifierSet> ModifiersList = new();
+
+        /// <summary>
+        ///     A flat amount of damage to add. Same reason as above with Multiplier.
+        /// </summary>
+        public int FlatDamage = 0;
+
         /// <summary>
         ///     A list containing every hit entity. Can be zero.
         /// </summary>