contrib: add more UWP support

contrib/build_all_uwp.bat

contrib/src/boost/boost-uwp.patch

contrib/src/boost/fetch_and_patch.bat

contrib/src/cryptopp/cryptopp-uwp.patch

contrib/src/cryptopp/fetch_and_patch.bat

contrib/src/fetch_all_uwp.bat

contrib/src/ffmpeg/fetch_and_patch.bat

contrib/src/jsoncpp/fetch_and_patch.bat

contrib/src/jsoncpp/jsoncpp-uwp.patch

contrib/src/pcre/fetch_and_patch.bat

contrib/src/pcre/pcre-uwp.patch

contrib/src/pjproject/fetch_and_patch.bat

contrib/src/pjproject/pj_uwp_endianness.patch

contrib/src/pjproject/pj_uwp_fix_turn_fallback.patch

contrib/src/pjproject/pj_uwp_gnutls.patch

contrib/src/pjproject/pj_uwp_multiple_listeners.patch

contrib/src/portaudio/fetch_and_patch.bat

contrib/src/portaudio/pa-uwp.patch

contrib/src/pthreads/fetch_and_patch.bat

contrib/src/pthreads/pthreads-uwp.patch