Merge branch 'signal_tunnels_bridges-sx' into jgrpp

Conflicts:
	src/saveload/extended_ver_sl.cpp
	src/saveload/extended_ver_sl.h
	src/settings_type.h
	src/signal.cpp

src/saveload/extended_ver_sl.h

@@ -27,6 +27,7 @@ enum SlXvFeatureIndex {
 	XSLFI_DEPARTURE_BOARDS,                       ///< Departure boards patch, in ticks mode
 	XSLFI_TIMETABLES_START_TICKS,                 ///< Timetable start time is in ticks, instead of days (from departure boards patch)
 	XSLFI_TOWN_CARGO_ADJ,                         ///< Town cargo adjustment patch
+	XSLFI_SIG_TUNNEL_BRIDGE,                      ///< Signals on tunnels and bridges
 
 	XSLFI_SIZE,                                   ///< Total count of features, including null feature
 };