Glowsticks, flares and lighting behaviours (#1886)

* Assets

* LightingBehaviours, flares, and such.

* More changes

* More changes, more flare work.

* More work on flares + light behaviours

* another refactor

* missed

* Light behaviours refactor, added sfx, improved graphics, improved lighting effects for glowstick and flare.

* remove unneeded value

* nullables

* remove old code

* nullable

* one last push

* net id

* more work

* more colors for glowsticks

* Adjust flare so it fades in

* fix name

* sprite fix

Content.Client/GameObjects/Components/ExpendableLightVisualizer.cs

@@ -0,0 +1,39 @@
+
+using Content.Shared.GameObjects.Components;
+using JetBrains.Annotations;
+using Robust.Client.GameObjects;
+using System;
+
+namespace Content.Client.GameObjects.Components
+{
+    [UsedImplicitly]
+    public class ExpendableLightVisualizer : AppearanceVisualizer
+    {
+        public override void OnChangeData(AppearanceComponent component)
+        {
+            base.OnChangeData(component);
+
+            if (component.Deleted)
+            {
+                return;
+            }
+
+            if (component.TryGetData(ExpendableLightVisuals.State, out string lightBehaviourID))
+            {
+                if (component.Owner.TryGetComponent<LightBehaviourComponent>(out var lightBehaviour))
+                {
+                    lightBehaviour.StopLightBehaviour();
+
+                    if (lightBehaviourID != string.Empty)
+                    {
+                        lightBehaviour.StartLightBehaviour(lightBehaviourID);
+                    }
+                    else if (component.Owner.TryGetComponent<PointLightComponent>(out var light))
+                    {
+                        light.Enabled = false;
+                    }
+                }
+            }
+        }
+    }
+}