[8608] implement BattleGround Alterac Valley

sql won't be included - please look at your database
providers forum

also note, that creature_loot_template id 0
is used for the loot of dead players in this bg
(after a player died and you remove insignia from him..
he not only drops money - he drops some random items too)

further work must be done in better code for adjusting right
levels to creatures - maybe using something similar like it's
done in heroic instances

also quests and creatures needs some scripts in future

thanks to:
netsky - initial start of this patch
bogie - 2nd person writing on this patch
triply, kapatejib, vladimir - code review and suggestions
arrai - for his great tool and help
and all testers / code contributers - I won't write
down a list, else I would forget most probably one ^^

src/game/Creature.cpp

@@ -366,6 +366,9 @@ void Creature::Update(uint32 diff)
                 else
                     setDeathState( JUST_ALIVED );
 
+                if (GetMap()->IsBattleGround() && ((BattleGroundMap*)GetMap())->GetBG())
+                    ((BattleGroundMap*)GetMap())->GetBG()->OnCreatureRespawn(this); // for alterac valley needed to adjust the correct level again
+
                 //Call AI respawn virtual function
                 i_AI->JustRespawned();