Core/Objects: Unify Searcher classes into one common implementation

Port From (https://github.com/TrinityCore/TrinityCore/commit/261eb201bf107cef441d9b075e8f23bf0edfbaf0)
Port From (https://github.com/TrinityCore/TrinityCore/commit/526b16fea41fb69a302fdebe8a727e175949f04b)
Port From (https://github.com/TrinityCore/TrinityCore/commit/8b7dce6521323e788ebf28297ec941a6f9bf876f)
Port From (https://github.com/TrinityCore/TrinityCore/commit/5334467f493eb16141f4ad0bce956bc3e19244a0)
Port From (https://github.com/TrinityCore/TrinityCore/commit/1e7725c15b149baaf96731231239769e482ec2ed)
Port From (https://github.com/TrinityCore/TrinityCore/commit/21712f475383f6f3fae107706f5de5195f75b760)

Source/Game/AI/ScriptedAI/ScriptedAI.cs

@@ -372,7 +372,7 @@ namespace Game.AI
             var searcher = new UnitLastSearcher(me, u_check);
             Cell.VisitAllObjects(me, searcher, range);
 
-            return searcher.GetTarget();
+            return searcher.GetResult();
         }
 
         //Returns a list of friendly CC'd units within range
@@ -404,7 +404,7 @@ namespace Game.AI
             var searcher = new PlayerSearcher(me, check);
             Cell.VisitWorldObjects(me, searcher, minimumRange);
 
-            return searcher.GetTarget();
+            return searcher.GetResult();
         }
 
         public void SetEquipmentSlots(bool loadDefault, int mainHand = -1, int offHand = -1, int ranged = -1)