Merge branch 'master' into jgrpp

Remove the viewport sign cache as this is now superseded by the kd tree
implementation

# Conflicts:
#	src/crashlog.cpp
#	src/lang/english.txt
#	src/misc.cpp
#	src/pathfinder/follow_track.hpp
#	src/pbs.cpp
#	src/rail_cmd.cpp
#	src/saveload/vehicle_sl.cpp
#	src/settings.cpp
#	src/settings_gui.cpp
#	src/ship_cmd.cpp
#	src/station.cpp
#	src/station_base.h
#	src/station_cmd.cpp
#	src/table/settings.ini
#	src/thread/thread_morphos.cpp
#	src/town_cmd.cpp
#	src/train_cmd.cpp
#	src/viewport.cpp
#	src/waypoint.cpp

src/waypoint.cpp

@@ -15,6 +15,7 @@
 #include "window_func.h"
 #include "newgrf_station.h"
 #include "waypoint_base.h"
+#include "viewport_kdtree.h"
 #include "tracerestrict.h"
 
 #include "safeguards.h"
@@ -55,5 +56,6 @@ Waypoint::~Waypoint()
 	if (CleaningPool()) return;
 	DeleteWindowById(WC_WAYPOINT_VIEW, this->index);
 	RemoveOrderFromAllVehicles(OT_GOTO_WAYPOINT, this->index);
+	_viewport_sign_kdtree.Remove(ViewportSignKdtreeItem::MakeWaypoint(this->index));
 	TraceRestrictRemoveDestinationID(TROCAF_WAYPOINT, this->index);
 }