Turn Angle to Waypoint or Cursor

[rgleason]

See this closed issue by Jnavas
#25

Good for determining when to tack or jibe.

Note that there are 2 different ways to calculate Turn Angle, Bearing to Waypoint versus:

COG (GPS)
Heading (compass)

There can be a difference between the two when there is current.
Since different users may prefer different calculations, it would be ideal to have both.

Our use case is internal GPS in an Android tablet with waypoints stored in the app, but others may need NMEA.