Allow creation of UTF-8 logs without a BOM.
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                 Key: LOG4NET-329
                 URL: https://issues.apache.org/jira/browse/LOG4NET-329
             Project: Log4net
          Issue Type: Wish
          Components: Appenders
    Affects Versions: 1.2.11
         Environment: Windows 7.
            Reporter: Ben Monroe
            Priority: Minor


When an appender uses the "utf-8" encoding, output logs will append a BOM to 
the start of a file. This is problematic when the log file is only supposed to 
output errors. Explorer reports the file size as non-0, so the only way to know 
if an error actually occurred is to open the log every time and check. This is 
not desirable.

Further, from the Unicode FAQ (http://unicode.org/faq/utf_bom.html), a BOM is 
unnecessary for UTF-8 since it is already a sequence of bytes, so there are no 
endian problems to solve in the first place.

Removal of the BOM is not necessary, but should also provide a means to use 
UTF-8 without a BOM. That could be a new encoding name such as "utf-8_nobom" or 
as a separate attribute such as "bom=false" or something else.


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