IMS-VT: Peer Resolution feature and split screen fix

-Implement Peer resolution feature. Change far end size
 based on peer resolution

-When VideoCallPanel's size changes, its children need
 to update their size accordingly. This enables the farend
 view ie.video_view to resize correctly after background call
 is dropped, in multiple call scenarios

Change-Id: I4313b972042d124b0ad2155d2cef6f1e8d418b7f
CRs-Fixed: 555075, 588216