Refactor Flammable to be ECS. (#4671)

- Refactor IHotItem into IsHotEvent.
- Refactor IFireAct into TileFireEvent.

Content.Shared/Atmos/Components/SharedFlammableComponent.cs

@@ -1,18 +0,0 @@
-using System;
-using Robust.Shared.GameObjects;
-using Robust.Shared.Serialization;
-
-namespace Content.Shared.Atmos.Components
-{
-    public class SharedFlammableComponent : Component
-    {
-        public override string Name => "Flammable";
-    }
-
-    [Serializable, NetSerializable]
-    public enum FireVisuals
-    {
-        OnFire,
-        FireStacks,
-    }
-}

Content.Shared/Atmos/FireVisuals.cs

@@ -0,0 +1,12 @@
+using System;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Atmos
+{
+    [Serializable, NetSerializable]
+    public enum FireVisuals
+    {
+        OnFire,
+        FireStacks,
+    }
+}

Content.Shared/Temperature/IHotItem.cs

@@ -1,17 +0,0 @@
-using Robust.Shared.Analyzers;
-
-namespace Content.Shared.Temperature
-{
-    /// <summary>
-    /// This interface gives components hot quality when they are used.
-    /// E.g if you hold a lit match or a welder then it will be hot,
-    /// presuming match is lit or the welder is on respectively.
-    /// However say you hold an item that is always hot like lava rock,
-    /// it will be permanently hot.
-    /// </summary>
-    [RequiresExplicitImplementation]
-    public interface IHotItem
-    {
-        bool IsCurrentlyHot();
-    }
-}

Content.Shared/Temperature/IsHotEvent.cs

@@ -0,0 +1,14 @@
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Temperature
+{
+    /// <summary>
+    ///     Directed event raised on entities to query whether they're "hot" or not.
+    ///     For example, a lit welder or matchstick would be hot, etc.
+    /// </summary>
+    public class IsHotEvent : EntityEventArgs
+    {
+        public bool IsHot { get; set; } = false;
+    }
+}