add tox friend faux offline message (still wonky) + small file copy error handling

src/CMakeLists.txt

@@ -61,6 +61,9 @@ add_executable(tomato
 	./tox_dht_cap_histo.hpp
 	./tox_dht_cap_histo.cpp
 
+	./tox_friend_faux_offline_messaging.hpp
+	./tox_friend_faux_offline_messaging.cpp
+
 	./chat_gui4.hpp
 	./chat_gui4.cpp
 )