Sweeping changes/improvements to the microwave. (#997)

Co-authored-by: FL-OZ <anotherscuffed@gmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Server/GameObjects/EntitySystems/MicrowaveSystem.cs

@@ -0,0 +1,25 @@
+using Content.Server.GameObjects.Components.Kitchen;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    public class MicrowaveSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+            EntityQuery = new TypeEntityQuery(typeof(MicrowaveComponent));
+        }
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+            foreach (var entity in RelevantEntities)
+            {
+                var comp = entity.GetComponent<MicrowaveComponent>();
+                comp.OnUpdate();
+            }
+        }
+    }
+}