add video frame type and debug viewer and debug test source

the test source thread will always exist for now
the debug view will open a window for each connection

src/CMakeLists.txt

@@ -110,9 +110,13 @@ target_sources(tomato PUBLIC
 
 	./frame_streams/sdl/sdl_audio2_frame_stream2.hpp
 	./frame_streams/sdl/sdl_audio2_frame_stream2.cpp
+	./frame_streams/sdl/video.hpp
 
 	./stream_manager_ui.hpp
 	./stream_manager_ui.cpp
+
+	./debug_video_tap.hpp
+	./debug_video_tap.cpp
 )
 
 if (TOMATO_TOX_AV)