Unify orientation calculation logic.

Unify orientation calculation logic.

Camera API takes clockwise degrees for JPEG rotation and
OrientationEventListener reports clockwise device orientation.
The easiest formula of calculating output image rotation degree is:
    "camera sensor orientation" + "device orientation"

Since front cameras face in opposite direction. The result needs to be mirrored
for front camera.

Detailed changes:
* Refactor OrientationManager to remove unnecessary complexity.
  * Add OrientationManager.DeviceOrientation enum and
    OrientationManager.getDeviceOrientation
  * Remove CameraUtil.roundOrientation.
  * Fix the weird calculation which is hard to understand in
    CameraUtil.getJpegRotation and add CameraUtil.getImageRotation
* Clean up image rotation logic in all modules:
  * Always look up the current device orientation via OrientationManager.getDeviceOrientation
  * Fix the doc for copyImagePlaneToBitmap() which actually rotates image
    counterclockwise.
* Clean up CameraActivity:
  * Remove CameraActivity.onOrientationChanged and
    ModuleController.onOrientationChanged. Any individual module which
    wants to listen orientation change should register itself to
    OrientationManager. Now only VideoModule needs to do that.

Bug: 17443789
Change-Id: I6d54cac5bde950acae0c3226448c27a816266df0