Damage rework (#2525)

* Make damage work through messages and events, make destructible not inherit ruinable or reference damageable

* Copy sound logic to destructible component for now

* Fix typo

* Fix prototype error

* Remove breakable component damageable reference

* Remove breakable construction reference

* Remove ruinable component

* Move thresholds to individual components and away from damageable

* Add threshold property to damageable component code

* Add thresholds to destructible component, add states to damageable, remove damage container, fix up mob states

* Being alive isn't normal

* Fix not reading the id

* Merge fixes

* YAML fixes

* Grammar moment

* Remove unnecessary dependency

* Update thresholds doc

* Change naming of thresholds to states in MobStateComponent

* Being alive is once again normal

* Make DamageState a byte

* Bring out classes structs and enums from DestructibleComponent

* Add test for destructible thresholds

* Merge fixes

* More merge fixes and fix rejuvenate test

* Remove IMobState.IsConscious

* More merge fixes someone please god review this shit already

* Fix rejuvenate test

* Update outdated destructible in YAML

* Fix repeatedly entering the current state

* Fix repeatedly entering the current state, add Threshold.TriggersOnce and expand test

* Update saltern

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

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+
+namespace Content.Shared.GameObjects.Components.Mobs
+{
+    public static class DamageStateHelpers
+    {
+        /// <summary>
+        ///     Enumerates over <see cref="DamageState"/>, returning them in order
+        ///     of alive to dead.
+        /// </summary>
+        /// <returns>An enumerable of <see cref="DamageState"/>.</returns>
+        public static IEnumerable<DamageState> AliveToDead()
+        {
+            foreach (DamageState state in Enum.GetValues(typeof(DamageState)))
+            {
+                if (state == DamageState.Invalid)
+                {
+                    continue;
+                }
+
+                yield return state;
+            }
+        }
+    }
+}