release v6.6.2
Tophat Version bump, NEWS.txt 1.0.4 beta
TaskNavSliderShape.cpp: draw distance in center

swap position of distance and altitude so
distance is in center, altitude in upper right
TaskNavSliderWidget: draw bearing chevrons next to distance

draws zero, one or two bearing chevrons next to distance
to indicate relative bearing of navigation tp
NEWS.txt: update 1.0.4