Core/Maps: Unload transports in MapManager::UnloadAll instead of singleton destructor.

Core/Transports: Properly delink units from transports on transport desutruction. - Thanks to Shauren for help.
Core/ObjectAccessor: Unload corpse 'storage' in added UnloadAll method called in WorldRunnable postservice hook.
Core/Master: Change some postservice queries to syncrhonous (direct) execution to ensure execution on shutdown
Core/Master: Remove redundant calls to ACE::init and ACE::fini

These changes were made to fix crash/freeze issues on shutdown.

src/server/game/Entities/Transport/Transport.cpp

@@ -180,8 +180,11 @@ Transport::Transport(uint32 period, uint32 script) : GameObject(), m_period(peri
 
 Transport::~Transport()
 {
-    for (CreatureSet::iterator itr = m_NPCPassengerSet.begin(); itr != m_NPCPassengerSet.end();)
-        (*(itr++))->ForcedDespawn();
+    for (CreatureSet::iterator itr = m_NPCPassengerSet.begin(); itr != m_NPCPassengerSet.end(); ++itr)
+    {
+        (*itr)->SetTransport(NULL);
+        GetMap()->AddObjectToRemoveList(*itr);
+    }
 
     m_NPCPassengerSet.clear();