call: move ICE transport into SIPCall class

Just moving all ICE transport related methods from Call class
into the SIPCall call.
This is done in the mind of refactoring media transport system.

Call is agnostic to transport implementation and this stuff
has to be handled by concrete classes of Call that known all about
transport information.

Note: <algorithm> included in audiolayer.cpp to make this patch
buildable on UWP platform.

Change-Id: I04b780dcff3483237a2de3c47ee667df9bba9f97
Reviewed-by: Olivier SOLDANO <olivier.soldano@savoirfairelinux.com>