Update CMakeLists.txt

WinRT capture support

Update cap_msmf.cpp

Create cap_msmf.hpp

Update cap_msmf.cpp

Update cap_msmf.hpp

Update cap_msmf.hpp

Update cap_msmf.cpp

Update cap_msmf.hpp

Update cap_msmf.cpp

Update cap_msmf.hpp

Update cap_msmf.cpp

Update cap_msmf.hpp

Create ppltasks_winrt.h

Update cap_msmf.hpp

Update cap_msmf.hpp

Update cap_msmf.cpp