Core/Db/Conditions: Prepare conditions system to work on objects of different type than players.

Warning: API has changed a bit:
ConditionScript::OnConditionCheck(Condition* condition, Player* player, Unit* invoker) is now
ConditionScript::OnConditionCheck(Condition* condition, WorldObject* object, WorldObject* invoker)

src/server/game/AI/SmartScripts/SmartScript.cpp

@@ -90,7 +90,7 @@ void SmartScript::ProcessEventsFor(SMART_EVENT e, Unit* unit, uint32 var0, uint3
                 if (Player* player = unit->ToPlayer())
                 {
                     ConditionList conds = sConditionMgr->GetConditionsForSmartEvent((*i).entryOrGuid, (*i).event_id, (*i).source_type);
-                    meets = sConditionMgr->IsPlayerMeetToConditions(player, conds);
+                    meets = sConditionMgr->IsObjectMeetToConditions(player, conds);
                 }
             }