Feature: [GS] Scriptable league tables (#10001)

(cherry picked from commit 5e14a20b3b)

src/saveload/league_sl.cpp

@@ -0,0 +1,23 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file league_sl.cpp Code handling saving and loading of league tables */
+#include "../stdafx.h"
+
+#include "saveload.h"
+
+struct GetLeagueChunkLoadInfo
+{
+	static SaveLoadVersion GetVersion() { return SLV_MULTITRACK_LEVEL_CROSSINGS; }
+};
+
+static const ChunkHandler league_chunk_handlers[] = {
+	MakeUpstreamChunkHandler<'LEAE', GetLeagueChunkLoadInfo>(),
+	MakeUpstreamChunkHandler<'LEAT', GetLeagueChunkLoadInfo>(),
+};
+
+extern const ChunkHandlerTable _league_chunk_handlers(league_chunk_handlers);