No longer truncate savegame version in gamelog.

Add an extended feature for changed savegame format.

src/saveload/extended_ver_sl.cpp

@@ -71,6 +71,7 @@ const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
 	{ XSLFI_TEMPLATE_REPLACEMENT,   XSCF_NULL,                1,   1, "template_replacement",      NULL, NULL, "TRPL,TMPL" },
 	{ XSLFI_MORE_RAIL_TYPES,        XSCF_NULL,                1,   1, "more_rail_types",           NULL, NULL, NULL        },
 	{ XSLFI_CARGO_TYPE_ORDERS,      XSCF_NULL,                1,   1, "cargo_type_orders",         NULL, NULL, "ORDX"      },
+	{ XSLFI_EXTENDED_GAMELOG,       XSCF_NULL,                1,   1, "extended_gamelog",          NULL, NULL, NULL        },
 
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, NULL, NULL, NULL, NULL },// This is the end marker
 };