Kobo/System.cpp: fix bug for non-kobo build
WaypointIconRenderer.cpp: never use small turnpoint icon

It is tiny when zoomed out, but might be critical
InputEventActions.cpp: fix error when add panning waypoing if no terrain file

Was crashing if terrain file was null
map_turnpoint.svg: fill center to make easier to see on map

An observation zone makes it easy to distinguish whether it is
in the task or not.
NEWS.txt