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

Leave afterload in src/saveload/

src/saveload/compat/cargopacket_sl_compat.h

@@ -0,0 +1,32 @@
+/*
+ * 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 cargopacket_sl_compat.h Loading for cargopacket chunks before table headers were added. */
+
+#ifndef SAVELOAD_COMPAT_CARGOPACKET_H
+#define SAVELOAD_COMPAT_CARGOPACKET_H
+
+#include "../saveload.h"
+
+namespace upstream_sl {
+
+/** Original field order for _cargopacket_desc. */
+const SaveLoadCompat _cargopacket_sl_compat[] = {
+	SLC_VAR("source"),
+	SLC_VAR("source_xy"),
+	SLC_VAR("loaded_at_xy"),
+	SLC_VAR("count"),
+	SLC_VAR("days_in_transit"),
+	SLC_VAR("feeder_share"),
+	SLC_VAR("source_type"),
+	SLC_VAR("source_id"),
+	SLC_NULL(1, SL_MIN_VERSION, SLV_121),
+};
+
+}
+
+#endif /* SAVELOAD_COMPAT_CARGOPACKET_H */