Replaykit for unity

Setting

add Privacy - Microphone Usage Description，Privacy - Camera Usage Descriptiion to info.plist
add ReplayKit.framework to Build Phases / Link Binary With Libraries
set Deployment Target 10.0

Bugs

tested on ios10 beta, build on xcode8 GM
sometimes can not see cameraPreviewView because RPScreenRecorder.cameraPreviewView == nil，
sometimes cameraPreviewView locked on one frame