Split out Catch::cout/cerr/clog into their own file

src/catch2/internal/catch_fatal_condition_handler.cpp

@@ -30,6 +30,7 @@
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/interfaces/catch_interfaces_capture.hpp>
 #include <catch2/internal/catch_windows_h_proxy.hpp>
+#include <catch2/internal/catch_stdstreams.hpp>
 
 #include <algorithm>