[AD] Fix taking photos on Xperia devices

It seems that the Xperia default camera app respects EXTRA_OUTPUT, but
still provides the path back to you anyway unlike some other apps that
respect EXTRA_OUTPUT.
[iOS] Follow guidance on taking photos for iPad

UIImagePickerController guidance specifies that for taking video/photo,
you should go fullscreen, but stay in a popup for selecting images.
[iOS] Set MP sample universal and name/identifier
[iOS] Fix MP sample title bar
[iOS] Rename TakeMedia to more apt GetMediaAsync
Merge branch 'fix-xperia-mediapicker'