Adds FlammableComponent, humans can now catch on fire. (#2115)

Content.Shared/GameObjects/Components/Atmos/SharedFlammableComponent.cs

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

Content.Shared/GameObjects/Components/Mobs/SharedStatusEffectsComponent.cs

@@ -57,6 +57,8 @@ namespace Content.Shared.GameObjects.Components.Mobs
         Hunger,
         Thirst,
         Pressure,
+        Fire,
+        Temperature,
         Stun,
         Cuffed,
         Buckled,

Content.Shared/GameObjects/Components/Movement/SharedSlipperyComponent.cs

@@ -112,6 +112,7 @@ namespace Content.Shared.GameObjects.Components.Movement
             {
                 if (!uid.IsValid() || !_entityManager.EntityExists(uid))
                 {
+                    _slipped.Remove(uid);
                     continue;
                 }