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Remove the viewport sign cache as this is now superseded by the kd tree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/misc.cpp

@@ -28,6 +28,9 @@
 #include "core/pool_type.hpp"
 #include "game/game.hpp"
 #include "linkgraph/linkgraphschedule.h"
+#include "station_kdtree.h"
+#include "town_kdtree.h"
+#include "viewport_kdtree.h"
 #include "tracerestrict.h"
 #include "programmable_signals.h"
 #include "viewport_func.h"
@@ -68,7 +71,6 @@ void InitializeGame(uint size_x, uint size_y, bool reset_date, bool reset_settin
 	AllocateMap(size_x, size_y);
 
 	ViewportMapClearTunnelCache();
-	ViewportClearStationSignCache();
 	ClearCommandLog();
 
 	_pause_mode = PM_UNPAUSED;
@@ -92,6 +94,10 @@ void InitializeGame(uint size_x, uint size_y, bool reset_date, bool reset_settin
 	ClearCargoPacketDeferredPayments();
 	PoolBase::Clean(PT_NORMAL);
 
+	RebuildStationKdtree();
+	RebuildTownKdtree();
+	RebuildViewportKdtree();
+
 	FreeSignalPrograms();
 	FreeSignalDependencies();