Make mechanism behaviors properly update, fix eating and drinking (#2472)

* Make mechanisms properly update and fix eating and drinking

* Remove outdated component ignores

* Fix nullable error

* Fix mechanism behavior events

* Remove unnecessary code

Content.Client/GameObjects/Components/Body/Mechanism/HeartBehaviorComponent.cs

@@ -1,12 +0,0 @@
-using Content.Shared.GameObjects.Components.Body.Behavior;
-using Robust.Shared.GameObjects;
-
-namespace Content.Client.GameObjects.Components.Body.Mechanism
-{
-    [RegisterComponent]
-    [ComponentReference(typeof(SharedHeartBehaviorComponent))]
-    public class HeartBehaviorComponent : SharedHeartBehaviorComponent
-    {
-        public override void Update(float frameTime) { }
-    }
-}

Content.Client/IgnoredComponents.cs

@@ -58,7 +58,6 @@
             "Drink",
             "Food",
             "FoodContainer",
-            "Stomach",
             "Rotatable",
             "MagicMirror",
             "FloorTile",
@@ -180,10 +179,8 @@
             "BreakableConstruction",
             "GasCanister",
             "GasCanisterPort",
-            "Lung",
             "Cleanable",
             "Configuration",
-            "Brain",
             "PlantHolder",
             "SeedExtractor",
             "Produce",