Remove most IEntity usages from explosions (#5240)

* Remove most IEntity usages from Destructible and Explosions

* Perform a minute amount of cleanup

* Fix build

Content.Server/Explosion/Components/ClusterFlashComponent.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Threading.Tasks;
+using Content.Server.Explosion.EntitySystems;
 using Content.Server.Flash.Components;
 using Content.Server.Throwing;
 using Content.Shared.Explosion;

Content.Server/Explosion/Components/DeleteOnTriggerComponent.cs

@@ -1,3 +1,4 @@
+using Content.Server.Explosion.EntitySystems;
 using Robust.Shared.GameObjects;
 
 namespace Content.Server.Explosion.Components

Content.Server/Explosion/Components/ExplosionLaunchedComponent.cs

@@ -15,7 +15,7 @@ namespace Content.Server.Explosion.Components
                 return;
 
             var sourceLocation = eventArgs.Source;
-            var targetLocation = eventArgs.Target.Transform.Coordinates;
+            var targetLocation = Owner.EntityManager.GetComponent<TransformComponent>(eventArgs.Target).Coordinates;
 
             if (sourceLocation.Equals(targetLocation)) return;
 
@@ -27,7 +27,7 @@ namespace Content.Server.Explosion.Components
                 ExplosionSeverity.Light => 20,
                 _ => 0,
             };
-            
+
             Owner.TryThrow(direction, throwForce);
         }
     }

Content.Server/Explosion/Components/OnUseTimerTriggerComponent.cs

@@ -1,4 +1,5 @@
 using System;
+using Content.Server.Explosion.EntitySystems;
 using Content.Shared.Interaction;
 using Content.Shared.Trigger;
 using Robust.Server.GameObjects;

Content.Server/Explosion/Components/SoundOnTriggerComponent.cs

@@ -1,3 +1,4 @@
+using Content.Server.Explosion.EntitySystems;
 using Content.Shared.Sound;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization.Manager.Attributes;