Move upstream saveload to src/saveload/, move jgrpp saveload to src/sl/

Leave afterload in src/saveload/

src/sl/tunnel_sl.cpp

@@ -0,0 +1,50 @@
+/*
+ * 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 tunnel_sl.cpp Code handling saving and loading of tunnels */
+
+#include "../stdafx.h"
+#include "../tunnel_base.h"
+
+#include "saveload.h"
+
+#include "../safeguards.h"
+
+
+static const SaveLoad _tunnel_desc[] = {
+	 SLE_CONDVAR(Tunnel, tile_n,           SLE_UINT32,             SL_MIN_VERSION, SL_MAX_VERSION),
+	 SLE_CONDVAR(Tunnel, tile_s,           SLE_UINT32,             SL_MIN_VERSION, SL_MAX_VERSION),
+	 SLE_CONDVAR(Tunnel, height,            SLE_UINT8,             SL_MIN_VERSION, SL_MAX_VERSION),
+	 SLE_CONDVAR(Tunnel, is_chunnel,         SLE_BOOL,             SL_MIN_VERSION, SL_MAX_VERSION),
+	SLE_CONDVAR_X(Tunnel, style,            SLE_UINT8,             SL_MIN_VERSION, SL_MAX_VERSION, SlXvFeatureTest(XSLFTO_AND, XSLFI_NEW_SIGNAL_STYLES)),
+};
+
+static void Save_TUNN()
+{
+	for (Tunnel *tunnel : Tunnel::Iterate()) {
+		SlSetArrayIndex(tunnel->index);
+		SlObject(tunnel, _tunnel_desc);
+	}
+}
+
+static void Load_TUNN()
+{
+	int index;
+
+	while ((index = SlIterateArray()) != -1) {
+		Tunnel *tunnel = new (index) Tunnel();
+		SlObject(tunnel, _tunnel_desc);
+		tunnel->UpdateIndexes();
+	}
+}
+
+
+extern const ChunkHandler tunnel_chunk_handlers[] = {
+	{ 'TUNN', Save_TUNN, Load_TUNN, nullptr, nullptr, CH_ARRAY },
+};
+
+extern const ChunkHandlerTable _tunnel_chunk_handlers(tunnel_chunk_handlers);