Change Eluna to a global variable

Remove Eluna* from being passed. You can now get it through Eluna::GetEluna(L)
Change function call cleanup to lua_settop instead of manual loop
Explicitly delete the copy constructor and copy assignment operators

LuaFunctions.cpp

@@ -37,7 +37,7 @@ extern "C"
 #include "VehicleMethods.h"
 #include "BattleGroundMethods.h"
 
-ElunaGlobal::ElunaRegister GlobalMethods[] =
+luaL_Reg GlobalMethods[] =
 {
     // Hooks
     { "RegisterPacketEvent", &LuaGlobalFunctions::RegisterPacketEvent },