Range of Motion Tasks - added support for all device orientations

[davwillev]

This pull request updates the Range of Motion tasks with support for all device orientations. Several enhancements have been made:

• The task should now report correct angles irrespective of device orientation, whether portrait, portrait upside down, landscape left or landcape right (currently only portrait and landscape left are supported).
• The ROM tasks now use physical device orientation (UIDeviceOrientation) instead of the orientation of the app's user interface (UIInterfaceOrientation). This is particularly important when the user is not lookimg at the screen (as in the ROM tasks).
• An additional NSInteger 'orientation' result variable has been added to report the initial orientation of the device during the task. This will enable researchers and developers to see the orientation of the device at the commencement of the task.

[davwillev]

Apologies for the recent high number of commits. I realised that I had inadvertantly merged in some work that is 'in progress' and had to revert this. The PR is now clean and ready to merge

[davwillev]

Hi @srinathtm-apple and @Pariecemckinney-apple
Is there any chance you could review these changes?
Thanks!

[davwillev]

Hey @ninoguba
I spotted you are active at the moment. Any chance you could review these changes, since you are fairly familiar with the RoM tasks?
Much appreciated!

[ninoguba]

@davwillev Hi. Actually I'm not very familiar with the RoM tasks so I'll defer first to folks at Apple to conduct their review of your PR. Please nudge them again.

[davwillev]

OK, thanks, @ninoguba
@srinathtm-apple !?

[davwillev]

@srinathtm-apple
I noticed that you were active here at the moment. ANy chance you could review this PR? Thanks!