5.17.4 SDK Integrated UIKIT Release

##New Feature
A new metadata parameter of type CallMetadata was added to all makeCall methods to support sending additional call data.
##Modified
CallMetadata were now available in MissedCallNotificationDelegate and getDisplayName method of CallManagerDelegate protocols
VOIPManager.sharedInstance.processPayload() method now takes optional displayName param to set the caller's name when reporting to CallKit