Eluna implementation (#847)

* azerothcore + eluna done.

* Remove the Eluna single thread limit.

* Read Eluna Settings file.

* submodule change.

* fix(test)  Ubuntu - Cant Link Library after Compile

* The ELUNA is disabled by default.

* remove submodule luaEngine.

* some change

* fix a error

* change cmake

* fix: some onplayerchat does not have hooks.

* Eluna: Add BG event Hooks.

* fix:cmake hook AFTER_LOAD_CONF not work.

* Remove the eluna switch.

* Remove some define in the core.

* fix conf file not read in the linux.

* eluna : change bg hook parameter type

* Remove TC log function call

* change bg hook OnBGEnd parameter type.


Note: to enable Eluna, the module is required

src/common/Database/QueryResult.h

@@ -27,7 +27,9 @@ class ResultSet
         bool NextRow();
         uint64 GetRowCount() const { return _rowCount; }
         uint32 GetFieldCount() const { return _fieldCount; }
-
+#ifdef ELUNA
+        char* GetFieldName(uint32 index) const;
+#endif
         Field* Fetch() const { return _currentRow; }
         const Field & operator [] (uint32 index) const
         {