Core: Easy module conf creation & reload (#931)

* Change the read method of the config of the module.Developers can now easily read the config file in cmake.

e.g. AC_ADD_CONFIG_FILE("${CMAKE_CURRENT_LIST_DIR}/conf/my_first_module.conf.dist")

* Update Master.h

* Update cs_reload.cpp

Command: `.reload config` can now reload the config file of all modules #981

src/server/worldserver/Master.cpp

@@ -153,6 +153,9 @@ int Master::Run()
     // set server offline (not connectable)
     LoginDatabase.DirectPExecute("UPDATE realmlist SET flag = (flag & ~%u) | %u WHERE id = '%d'", REALM_FLAG_OFFLINE, REALM_FLAG_INVALID, realmID);
 
+    //set module config file list
+    sWorld->SetConfigFileList(CONFIG_FILE_LIST);
+
     ///- Initialize the World
     sWorld->SetInitialWorldSettings();