Update DamageableSystem to modern standards (#39417)

* Update DamageableSystem to modern standards

* DamageContainerId -> DamageContainerID with lint flag

* Replace strings with protoids

* Make CVar subscription declarations all consistently whitespaced

* ChangeDamage -> TryChangeDamage, cope with C# jank

* Revert event signature changes

* Restore a comment

* Re-add two queries

* Init the queries

* Use appearanceQuery in DamageChanged

* Use damageableQuery in TryChangeDamage

* Use damageableQuery in SetDamageModifierSetId

* Final cleanup, fix sandboxing

* Rectify ExplosionSystem:::ProcessEntity's call to TryChangeDamage

* Re-organize DamageableSystem

* first big fuck you breaking change.

* THATS A LOT OF DAMAGE!!!

* Fix test fails

* test fixes 2

* push it

---------

Co-authored-by: Princess Cheeseballs <66055347+Pronana@users.noreply.github.com>

Content.Server/Guardian/GuardianSystem.cs

@@ -1,7 +1,7 @@
 using Content.Server.Body.Systems;
 using Content.Server.Popups;
 using Content.Shared.Actions;
-using Content.Shared.Damage;
+using Content.Shared.Damage.Systems;
 using Content.Shared.DoAfter;
 using Content.Shared.Examine;
 using Content.Shared.Guardian;
@@ -285,8 +285,8 @@ namespace Content.Server.Guardian
             if (args.DamageDelta == null || component.Host == null || component.DamageShare == 0)
                 return;
 
-            _damageSystem.TryChangeDamage(
-                component.Host,
+            _damageSystem.ChangeDamage(
+                component.Host.Value,
                 args.DamageDelta * component.DamageShare,
                 origin: args.Origin,
                 ignoreResistances: true,