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/scripts/Spells/spell_item.cpp

@@ -1088,7 +1088,7 @@ class spell_magic_eater_food : public SpellScriptLoader
         {
             PrepareAuraScript(spell_magic_eater_food_AuraScript);
 
-            void HandleTriggerSpell(AuraEffect const* aurEff)
+            void HandleTriggerSpell(AuraEffect const* /*aurEff*/)
             {
                 PreventDefaultAction();
                 Unit* target = GetTarget();