Add setting to increase station catchment radius.

Update acceptance and refresh screen when catchment settings change.

src/saveload/extended_ver_sl.cpp

@@ -72,6 +72,7 @@ const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
 	{ XSLFI_MORE_RAIL_TYPES,        XSCF_NULL,                1,   1, "more_rail_types",           NULL, NULL, NULL        },
 	{ XSLFI_CARGO_TYPE_ORDERS,      XSCF_NULL,                2,   2, "cargo_type_orders",         NULL, NULL, "ORDX,VEOX" },
 	{ XSLFI_EXTENDED_GAMELOG,       XSCF_NULL,                1,   1, "extended_gamelog",          NULL, NULL, NULL        },
+	{ XSLFI_STATION_CATCHMENT_INC,  XSCF_NULL,                1,   1, "station_catchment_inc",     NULL, NULL, NULL        },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, NULL, NULL, NULL, NULL },// This is the end marker
 };