Made a fancier lasergun (#174)

Laserguns now have an internal capacitor that can be recharged by using it with a power cell

Makes the final fix for #138

Content.Server/GameObjects/Components/Power/PowerCellComponent.cs

@@ -31,6 +31,7 @@ namespace Content.Server.GameObjects.Components.Power
             base.DeductCharge(toDeduct);
 
             _updateAppearance();
+            ChargeChanged();
         }
 
         public override void AddCharge(float charge)
@@ -38,6 +39,7 @@ namespace Content.Server.GameObjects.Components.Power
             base.AddCharge(charge);
 
             _updateAppearance();
+            ChargeChanged();
         }
 
         private void _updateAppearance()