Only use std::cout/ cert via Catch::cout/ cert - and make those conditional on CATCH_CONFIG_NOSTDOUT

include/internal/catch_console_colour_impl.hpp

@@ -115,7 +115,7 @@ namespace {
         }
     private:
         void setColour( const char* _escapeCode ) {
-            std::cout << '\033' << _escapeCode;
+            Catch::cout() << '\033' << _escapeCode;
         }
     };