Merge branch 'progsig-sx' into jgrpp

Conflicts:
	src/command.cpp
	src/command_type.h
	src/lang/english.txt
	src/rail_cmd.cpp
	src/rail_gui.cpp
	src/saveload/extended_ver_sl.cpp
	src/saveload/extended_ver_sl.h
	src/saveload/saveload.cpp
	src/widgets/rail_widget.h
	src/window_type.h

src/openttd.cpp

@@ -63,6 +63,7 @@
 #include "subsidy_func.h"
 #include "gfx_layout.h"
 #include "viewport_sprite_sorter.h"
+#include "programmable_signals.h"
 
 #include "linkgraph/linkgraphschedule.h"
 #include "tracerestrict.h"
@@ -306,6 +307,9 @@ static void ShutdownGame()
 	ClearTraceRestrictMapping();
 	PoolBase::Clean(PT_ALL);
 
+	FreeSignalPrograms();
+	FreeSignalDependencies();
+
 	/* No NewGRFs were loaded when it was still bootstrapping. */
 	if (_game_mode != GM_BOOTSTRAP) ResetNewGRFData();