Core: Crash fix (TemporarySummon), remove some warnings and some other minor changes

- "const uint64" and "uint64 const" --> uint64
 - Add some info in LFGDungeonEntry
 - Move some definitions from ".h" files and move to ".cpp"

src/server/game/AI/SmartScripts/SmartAI.h

@@ -157,7 +157,7 @@ class SmartAI : public CreatureAI
         void SetData(uint32 id, uint32 value);
 
         // Used in scripts to share variables
-        void SetGUID(const uint64 guid, int32 id = 0);
+        void SetGUID(uint64 guid, int32 id = 0);
 
         // Used in scripts to share variables
         uint64 GetGUID(int32 id = 0);