Core/Unit: cleanup UnitState enum

Port From (https://github.com/TrinityCore/TrinityCore/commit/1f0dc07ef183eefab5ad2c4a4f857d5184f5ad6f)

Source/Framework/Constants/UnitConst.cs

@@ -456,7 +456,6 @@ namespace Framework.Constants
         Possessed = 0x10000,
         Charging = 0x20000,
         Jumping = 0x40000,
-        //Onvehicle = 0x80000,
         Move = 0x100000,
         Rotating = 0x200000,
         Evade = 0x400000,
@@ -472,17 +471,18 @@ namespace Framework.Constants
                             | Possessed | Charging | Jumping | Move | Rotating
                             | Evade | RoamingMove | ConfusedMove | FleeingMove
                             | ChaseMove | FollowMove | IgnorePathfinding,
+
         Unattackable = InFlight,
-        // For Real Move Using Movegen Check And Stop (Except Unstoppable Flight)
         Moving = RoamingMove | ConfusedMove | FleeingMove | ChaseMove | FollowMove,
         Controlled = (Confused | Stunned | Fleeing),
         LostControl = (Controlled | Jumping | Charging),
         Sightless = (LostControl | Evade),
         CannotAutoattack = (LostControl | Casting),
         CannotTurn = (LostControl | Rotating),
-        // Stay By Different Reasons
         NotMove = Root | Stunned | Died | Distracted,
-        AllState = 0xffffffff                      //(Stopped | Moving | In_Combat | In_Flight)
+
+        AllErasable = AllStateSupported & ~IgnorePathfinding,
+        AllState = 0xffffffff
     }
 
     public enum UnitMoveType

Source/Game/Entities/Creature/Creature.cs

@@ -1570,7 +1570,7 @@ namespace Game.Entities
                 SetCannotReachTarget(false);
                 UpdateMovementFlags();
 
-                ClearUnitState(UnitState.AllState & ~UnitState.IgnorePathfinding);
+                ClearUnitState(UnitState.AllErasable);
 
                 if (!IsPet())
                 {

Source/Game/Movement/Generators/HomeMovement.cs

@@ -71,7 +71,7 @@ namespace Game.AI
             skipToHome = false;
             arrived = false;
 
-            owner.ClearUnitState(UnitState.AllState & ~(UnitState.Evade | UnitState.IgnorePathfinding));
+            owner.ClearUnitState(UnitState.AllErasable & ~UnitState.Evade);
         }
 
         public override MovementGeneratorType GetMovementGeneratorType()

Source/Game/Spells/SpellEffects.cs

@@ -4383,7 +4383,7 @@ namespace Game.Spells
             pet.SetDynamicFlags(UnitDynFlags.HideModel);
             pet.RemoveUnitFlag(UnitFlags.Skinnable);
             pet.SetDeathState(DeathState.Alive);
-            pet.ClearUnitState(UnitState.AllState);
+            pet.ClearUnitState(UnitState.AllErasable);
             pet.SetHealth(pet.CountPctFromMaxHealth(damage));
 
             pet.InitializeAI();