[core] Standardize transform origin

All Transform methods that take a PrecisionPoint now assume a “flipped” origin at the upper-left corner of the view. Previously, some methods assumed an origin at the lower-left corner.

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/views/MapView.java

@@ -3471,7 +3471,7 @@ public final class MapView extends FrameLayout {
                 // around gesture
                 mNativeMapView.setBearing(bearing,
                         detector.getFocusX() / mScreenDensity,
-                        (getHeight() - detector.getFocusY()) / mScreenDensity);
+                        detector.getFocusY() / mScreenDensity);
             } else {
                 // around center map
                 mNativeMapView.setBearing(bearing,