Adds portable flasher (#4523)

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/Flash/Components/FlashOnTriggerComponent.cs

@@ -11,7 +11,5 @@ namespace Content.Server.Flash.Components
     {
         [DataField("range")] internal float Range = 1.0f;
         [DataField("duration")] internal float Duration = 8.0f;
-
-        internal bool Flashed;
     }
 }