Merge branch 'master' into jgrpp-beta

# Conflicts:
#	src/saveload/cargopacket_sl.cpp
#	src/saveload/cheat_sl.cpp
#	src/saveload/company_sl.cpp
#	src/saveload/engine_sl.cpp
#	src/saveload/map_sl.cpp
#	src/saveload/order_sl.cpp
#	src/saveload/saveload.cpp
#	src/saveload/saveload.h
#	src/saveload/station_sl.cpp
#	src/saveload/vehicle_sl.cpp
#	src/settings.cpp
#	src/settings_gui.cpp
#	src/settings_internal.h
#	src/stdafx.h
#	src/table/settings/settings.ini
#	src/town_cmd.cpp
#	src/vehicle.cpp

src/tgp.cpp

@@ -659,9 +659,7 @@ static void HeightMapCurves(uint level)
 			for (uint t = 0; t < lengthof(curve_maps); t++) {
 				if (!HasBit(corner_bits, t)) continue;
 
-#ifdef WITH_ASSERT
-				bool found = false;
-#endif
+				[[maybe_unused]] bool found = false;
 				const control_point_t *cm = curve_maps[t].list;
 				for (uint i = 0; i < curve_maps[t].length - 1; i++) {
 					const control_point_t &p1 = cm[i];