Core/Db/Conditions: Add ContidionTarget column which allows selection of objects which will be checked by condition, depending on SourceTypeOrReferenceId.

So far usable only with CONDITION_SOURCE_TYPE_SPELL:
ContidionTarget = 0 - check caster
ContidionTarget = 1 - check explicit target

src/server/game/Scripting/ScriptMgr.h

@@ -62,6 +62,7 @@ class WorldObject;
 
 struct AchievementCriteriaData;
 struct AuctionEntry;
+struct ConditionSourceInfo;
 struct Condition;
 struct ItemTemplate;
 struct OutdoorPvPData;
@@ -572,7 +573,7 @@ class ConditionScript : public ScriptObject
         bool IsDatabaseBound() const { return true; }
 
         // Called when a single condition is checked for a player.
-        virtual bool OnConditionCheck(Condition* /*condition*/, WorldObject* /*object*/, WorldObject* /*invoker*/) { return true; }
+        virtual bool OnConditionCheck(Condition* /*condition*/, ConditionSourceInfo& /*sourceInfo*/) { return true; }
 };
 
 class VehicleScript : public ScriptObject
@@ -938,7 +939,7 @@ class ScriptMgr
 
     public: /* ConditionScript */
 
-        bool OnConditionCheck(Condition* condition, WorldObject* object, WorldObject* invoker);
+        bool OnConditionCheck(Condition* condition, ConditionSourceInfo& sourceInfo);
 
     public: /* VehicleScript */