Slight trigger refactor (#4320)

* Trigger tweaks

* Finish trigger refactor

* Clusterflash too

Content.Server/Explosion/Components/ExplodeOnTriggerComponent.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Explosion.Components
+{
+    /// <summary>
+    /// Explode using the entity's <see cref="ExplosiveComponent"/> if Triggered.
+    /// </summary>
+    [RegisterComponent]
+    public class ExplodeOnTriggerComponent : Component
+    {
+        public override string Name => "ExplodeOnTrigger";
+    }
+}