Core/Spells: Remade trajectory target selection

Port From (https://github.com/TrinityCore/TrinityCore/commit/3f7fe6f8a51f61083b4940eaadddc3b390f8e238)

Source/Framework/Constants/Spells/SpellConst.cs

@@ -30,6 +30,8 @@ namespace Framework.Constants
 
         public const int EffectFirstFound = 254;
         public const int EffectAll = 255;
+
+        public const float TrajectoryMissileSize = 3.0f;
     }
 
 
@@ -2416,7 +2418,8 @@ namespace Framework.Constants
         Channel,
         Nearby,
         Cone,
-        Area
+        Area,
+        Traj
     }
 
     public enum SpellTargetReferenceTypes