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File log observer.
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Log observer that writes to a file-like object.
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@param outFile: A file-like object. Ideally one should be passed which
accepts text data. Otherwise, UTF-8 L{bytes} will be used.
@param formatEvent: A callable that formats an event.
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Write event to file.
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Create a L{FileLogObserver} that emits text to a specified (writable)
file-like object.
@param outFile: A file-like object. Ideally one should be passed which
accepts text data. Otherwise, UTF-8 L{bytes} will be used.
@param timeFormat: The format to use when adding timestamp prefixes to
logged events. If L{None}, or for events with no C{"log_timestamp"}
key, the default timestamp prefix of C{"-"} is used.
@return: A file log observer.
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