Slight trigger refactor (#4320)

* Trigger tweaks

* Finish trigger refactor

* Clusterflash too

Content.Server/Flash/Components/FlashOnTriggerComponent.cs

@@ -0,0 +1,19 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Flash.Components
+{
+    /// <summary>
+    /// Upon being triggered will flash in an area around it.
+    /// </summary>
+    [RegisterComponent]
+    internal sealed class FlashOnTriggerComponent : Component
+    {
+        public override string Name => "FlashOnTrigger";
+
+        [DataField("range")] internal float Range = 1.0f;
+        [DataField("duration")] internal float Duration = 8.0f;
+
+        internal bool Flashed;
+    }
+}