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/Multis/Houses/MovingCrate.cs

@@ -273,8 +273,6 @@ namespace Server.Multis
             public InternalizeTimer(MovingCrate crate) : base(TimeSpan.FromMinutes(5.0))
             {
                 m_Crate = crate;
-
-                Priority = TimerPriority.FiveSeconds;
             }
 
             protected override void OnTick()

Projects/UOContent/Multis/Houses/PreviewHouse.cs

@@ -136,7 +136,6 @@ namespace Server.Multis
             public DecayTimer(Item item) : base(TimeSpan.FromSeconds(20.0))
             {
                 m_Item = item;
-                Priority = TimerPriority.OneSecond;
             }
 
             protected override void OnTick()