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913f79a661
This opens path to per-reporter colour output customization, and fixes multiple issues with the old colour implementation. Under the old implementation, using Win32-backed colouring would always change the colour used by the console, even if the actual output was written elsewhere, such as a file passed by the `--out` flag. This will no longer happen, as the reporter's colour impl will check that the reporter's stream is pointed to console before trying to change the colours. POSIX/ANSI colour implementation suffered a similar-ish issue, in that it only wrote the colour escape codes into the default output stream, even if the reporter asking for colouring was actually writing to a completely different output stream.