[LinphoneCallState] added enum for call linphones call states
[CallEndReason] added enum to encapsulate call end reasons
FIXUP [SimlarCallState] getCallStatusDisplayMessage
[SimlarCallState] added display message for normally ended calls
[CallActivity] always finish delayed when call ends
[CallActivity] moved call status to title
[SimlarCallState] added text for call status for talking
[CallActivity] now fades out when finishing delayed
[SimlarCallState] Code Cleanup: renamed mDisplayName, mDisplayPhotoId -> mContactName, mContactPhotoId