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/server/game/Server/WorldSocket.cpp

@@ -33,6 +33,9 @@
 #include "PacketLog.h"
 #include "ScriptMgr.h"
 #include "AccountMgr.h"
+#ifdef ELUNA
+#include "LuaEngine.h"
+#endif
 
 #if defined(__GNUC__)
 #pragma pack(1)