Flip name and units and sign of rotation API

Angle -> Bearing
Radians -> Degrees
Clockwise -> Counterclockwise

test/headless.cpp

@@ -74,7 +74,7 @@ TEST_P(HeadlessTest, render) {
         view.resize(width, height);
         map.resize(width, height);
         map.setLonLatZoom(longitude, latitude, zoom);
-        map.setAngle(bearing);
+        map.setBearing(bearing);
 
         // Run the loop. It will terminate when we don't have any further listeners.
         map.run();