fix(core): Adds Hashed & Hierarchical Timer Wheel (#655)

- Removes TimerPriority
- Removes TimerThread
- Adds a [Hashed & Hierarchical Timer Wheel](http://www.cs.columbia.edu/~nahum/w6998/papers/ton97-timing-wheels.pdf)

Projects/UOContent/Misc/AutoRestart.cs

@@ -4,7 +4,28 @@ namespace Server.Misc
 {
     public class AutoRestart : Timer
     {
-        public static bool Enabled; // is the script enabled?
+        private static Timer _autoRestart;
+        private static bool _enabled;
+
+        public static bool Enabled
+        {
+            get => _enabled;
+            set
+            {
+                if (value)
+                {
+                    _enabled = true;
+                    _autoRestart ??= new AutoRestart();
+                    _autoRestart.Start();
+                }
+                else
+                {
+                    _enabled = false;
+                    _autoRestart?.Stop();
+                    _autoRestart = null;
+                }
+            }
+        }
 
         private static readonly TimeSpan RestartTime = TimeSpan.FromHours(2.0); // time of day at which to restart
 
@@ -19,7 +40,6 @@ namespace Server.Misc
 
         public AutoRestart() : base(TimeSpan.FromSeconds(1.0), TimeSpan.FromSeconds(1.0))
         {
-            Priority = TimerPriority.FiveSeconds;
 
             m_RestartTime = DateTime.UtcNow.Date + RestartTime;
 
@@ -31,10 +51,14 @@ namespace Server.Misc
 
         public static bool Restarting { get; private set; }
 
+        public static void Configure()
+        {
+            Enabled = ServerConfiguration.GetOrUpdateSetting("world.enableAutoRestart", false);
+        }
+
         public static void Initialize()
         {
             CommandSystem.Register("Restart", AccessLevel.Administrator, Restart_OnCommand);
-            new AutoRestart().Start();
         }
 
         public static void Restart_OnCommand(CommandEventArgs e)

Projects/UOContent/Misc/AutoSave.cs

@@ -12,7 +12,9 @@ namespace Server.Misc
         public static TimeSpan Warning { get; private set; }
         public static string BackupPath { get; private set; }
 
-        public AutoSave() : base(Delay - Warning, Delay) => Priority = TimerPriority.OneMinute;
+        public AutoSave() : base(Delay - Warning, Delay)
+        {
+        }
 
         public static bool SavesEnabled { get; set; } = true;
 

Projects/UOContent/Misc/FoodDecay.cs

@@ -5,8 +5,9 @@ namespace Server.Misc
 {
     public class FoodDecayTimer : Timer
     {
-        public FoodDecayTimer() : base(TimeSpan.FromMinutes(5), TimeSpan.FromMinutes(5)) =>
-            Priority = TimerPriority.OneMinute;
+        public FoodDecayTimer() : base(TimeSpan.FromMinutes(5), TimeSpan.FromMinutes(5))
+        {
+        }
 
         public static void Initialize()
         {

Projects/UOContent/Misc/Guild.cs

@@ -546,8 +546,9 @@ namespace Server.Guilds
 
     public class WarTimer : Timer
     {
-        public WarTimer() : base(TimeSpan.FromMinutes(1.0), TimeSpan.FromMinutes(1.0)) =>
-            Priority = TimerPriority.FiveSeconds;
+        public WarTimer() : base(TimeSpan.FromMinutes(1.0), TimeSpan.FromMinutes(1.0))
+        {
+        }
 
         public static void Initialize()
         {

Projects/UOContent/Misc/LightCycle.cs

@@ -92,8 +92,9 @@ namespace Server
 
         private class LightCycleTimer : Timer
         {
-            public LightCycleTimer() : base(TimeSpan.FromSeconds(0), TimeSpan.FromSeconds(5.0)) =>
-                Priority = TimerPriority.FiveSeconds;
+            public LightCycleTimer() : base(TimeSpan.FromSeconds(0), TimeSpan.FromSeconds(5.0))
+            {
+            }
 
             protected override void OnTick()
             {
@@ -111,7 +112,6 @@ namespace Server
             public NightSightTimer(Mobile owner) : base(TimeSpan.FromMinutes(Utility.Random(15, 25)))
             {
                 m_Owner = owner;
-                Priority = TimerPriority.OneMinute;
             }
 
             protected override void OnTick()

Projects/UOContent/Misc/WebStatus.cs

@@ -19,9 +19,9 @@ namespace Server.Misc
 
         private static readonly object _StatusLock = new();
 
-        public StatusPage()
-            : base(TimeSpan.FromSeconds(5.0), TimeSpan.FromSeconds(60.0)) =>
-            Priority = TimerPriority.FiveSeconds;
+        public StatusPage() : base(TimeSpan.FromSeconds(5.0), TimeSpan.FromSeconds(60.0))
+        {
+        }
 
         public static void Initialize()
         {