Core/Dungeon Finder: Some optimizations.

- Store teleport coordinates to avoid recalculations each time someone has to be teleported
- Correct teleport error msg when player is charming or using vehicle
- Internal changes in storage types
- Proper code for missing achievement lock type
- Better debug msgs
- Trying to get rid of "Player*" and "Group*" inside LFGMgr as much as possible (Step 1)

src/server/scripts/World/npcs_special.cpp

@@ -2115,7 +2115,7 @@ class npc_shadowfiend : public CreatureScript
         {
             npc_shadowfiendAI(Creature* creature) : PetAI(creature) {}
 
-            void JustDied(Unit* killer)
+            void JustDied(Unit* /*killer*/)
             {
                 if (me->isSummon())
                     if (Unit* owner = me->ToTempSummon()->GetSummoner())