Merge branch 'infrastructure_sharing-sx' into jgrpp

Conflicts:
	src/lang/english.txt
	src/saveload/extended_ver_sl.cpp
	src/saveload/extended_ver_sl.h
	src/signal.cpp
	src/table/settings.ini
	src/vehicle.cpp

src/settings.cpp

@@ -69,6 +69,7 @@
 
 #include "void_map.h"
 #include "station_base.h"
+#include "infrastructure_func.h"
 
 #include "table/strings.h"
 #include "table/settings.h"
@@ -1309,6 +1310,28 @@ static bool StationCatchmentChanged(int32 p1)
 	return true;
 }
 
+static bool CheckSharingRail(int32 p1)
+{
+	if (!CheckSharingChangePossible(VEH_TRAIN)) return false;
+	UpdateAllBlockSignals();
+	return true;
+}
+
+static bool CheckSharingRoad(int32 p1)
+{
+	return CheckSharingChangePossible(VEH_ROAD);
+}
+
+static bool CheckSharingWater(int32 p1)
+{
+	return CheckSharingChangePossible(VEH_SHIP);
+}
+
+static bool CheckSharingAir(int32 p1)
+{
+	return CheckSharingChangePossible(VEH_AIRCRAFT);
+}
+
 static bool MaxVehiclesChanged(int32 p1)
 {
 	InvalidateWindowClassesData(WC_BUILD_TOOLBAR);
@@ -1316,7 +1339,6 @@ static bool MaxVehiclesChanged(int32 p1)
 	return true;
 }
 
-
 #ifdef ENABLE_NETWORK
 
 static bool UpdateClientName(int32 p1)