Merge branch 'master' into jgrpp

# Conflicts:
#	src/airport_gui.cpp
#	src/build_vehicle_gui.cpp
#	src/direction_type.h
#	src/gfx_type.h
#	src/group_gui.cpp
#	src/misc_gui.cpp
#	src/rail_gui.cpp
#	src/road_gui.cpp
#	src/signs_gui.cpp
#	src/slope_func.h
#	src/smallmap_gui.cpp
#	src/terraform_gui.cpp
#	src/toolbar_gui.cpp
#	src/town_gui.cpp
#	src/town_type.h
#	src/vehicle_type.h
#	src/widget_type.h

src/cheat_gui.cpp

@@ -219,7 +219,7 @@ static bool IsCheatAllowed(CheatNetworkMode mode)
 static_assert(CHT_NUM_CHEATS == lengthof(_cheats_ui));
 
 /** Widget definitions of the cheat GUI. */
-static const NWidgetPart _nested_cheat_widgets[] = {
+static constexpr NWidgetPart _nested_cheat_widgets[] = {
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
 		NWidget(WWT_CAPTION, COLOUR_GREY), SetDataTip(STR_CHEATS, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),