[11785] Implement dungeon encounters (DBC part), thanks to rsa for porting it to mangos

Signed-off-by: Laise <fenrisse@gmail.com>

src/game/Unit.cpp

@@ -793,6 +793,9 @@ uint32 Unit::DealDamage(Unit *pVictim, uint32 damage, CleanDamage const* cleanDa
                         if (save->GetResetTime() < resettime)
                             save->SetResetTime(resettime);
                     }
+                    
+                    // update encounter state if needed
+                    ((DungeonMap*)m)->GetPersistanceState()->UpdateEncounterState(ENCOUNTER_CREDIT_KILL_CREATURE, ((Creature*)cVictim)->GetEntry());
                 }
             }
         }