Merge branch 'tracerestrict-sx' into jgrpp

# Conflicts:
#	src/command.cpp
#	src/group_gui.cpp
#	src/lang/english.txt
#	src/saveload/extended_ver_sl.cpp
#	src/settings_gui.cpp
#	src/tracerestrict.cpp
#	src/tracerestrict.h
#	src/tracerestrict_gui.cpp
#	src/vehicle_gui.cpp
#	src/vehicle_gui_base.h
#	src/vehiclelist.cpp
#	src/window_type.h

src/command_type.h

@@ -371,6 +371,11 @@ enum Commands {
 	CMD_OPEN_CLOSE_AIRPORT,           ///< open/close an airport to incoming aircraft
 
 	CMD_PROGRAM_TRACERESTRICT_SIGNAL, ///< modify a signal tracerestrict program
+	CMD_CREATE_TRACERESTRICT_SLOT,    ///< create a tracerestrict slot
+	CMD_ALTER_TRACERESTRICT_SLOT,     ///< alter a tracerestrict slot
+	CMD_DELETE_TRACERESTRICT_SLOT,    ///< delete a tracerestrict slot
+	CMD_ADD_VEHICLE_TRACERESTRICT_SLOT,    ///< add a vehicle to a tracerestrict slot
+	CMD_REMOVE_VEHICLE_TRACERESTRICT_SLOT, ///< remove a vehicle from a tracerestrict slot
 
 	CMD_INSERT_SIGNAL_INSTRUCTION,    ///< insert a signal instruction
 	CMD_MODIFY_SIGNAL_INSTRUCTION,    ///< modifies a signal instruction