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/Engines/Quests/Dark Tides/Items/KronusScroll.cs

@@ -111,7 +111,6 @@ namespace Server.Engines.Quests.Necro
 
             public CallingTimer(PlayerMobile player) : base(TimeSpan.Zero, TimeSpan.FromSeconds(1.0), 6)
             {
-                Priority = TimerPriority.TwentyFiveMS;
 
                 m_Player = player;
                 m_Step = 0;

Projects/UOContent/Engines/Quests/Dark Tides/Mobiles/SummonedPaladin.cs

@@ -172,7 +172,6 @@ namespace Server.Engines.Quests.Necro
 
             public SummonTimer(PlayerMobile player) : base(TimeSpan.FromSeconds(4.0))
             {
-                Priority = TimerPriority.FiftyMS;
 
                 m_Player = player;
             }

Projects/UOContent/Engines/Quests/Witch Apprentice/Items/HagStew.cs

@@ -57,7 +57,6 @@ namespace Server.Items
             public ShowStew(AddonComponent ac) : base(TimeSpan.FromSeconds(30))
             {
                 stew = ac;
-                Priority = TimerPriority.OneSecond;
             }
 
             protected override void OnTick()