start refactoring Protocol/Carrier private classes into public parts
yarp::os::impl::OutputStream -> yarp::os::OutputStream
AuthHMAC needs String (no longer in OutputStream.h)
quick bugfix for missing namespace for OutputStream
Fixed missing GTHREAD library dependency in GUIs CMake files
Fixed newly added FindFreetype.cmake, which didn't find ftheader.h on Windows - patch to be tested and submitted upstream
Merge pull request #44 from elen4/master

bugfixes after build tests on Windows with YARP_USE_GTK2 and CREATE_SHARED_LIBRARY
more pruning of yarp::os::impl::Protocol
yarp::os::impl::InputStream -> yarp::os::InputStream (required porting ssize_t)
Merge branch 'master' into yarp-2.4