[whatwg/encoding] Adding BRF as "legacy" single-byte encoding for braille (#40)

Hello,

BRF is a charset that permits to encode braille. http://brl.thefreecat.org/test.php is an example of text file encoded in the BRF charset, holding 3 braille patterns. BRF is *the* standard way of providing documents ready for braille embossing, all official documents available on the web ready for embossing are using it (books, courses, tax forms, income declaration, etc.), as required per section 508 in the US for instance. There is currently no other really-used standard way of shipping them using UTF-8 (the PEF format is still at very early stage), you will *never* see BRF documents encoded in utf-8.

 For now, browsers ignore the "charset=brf" content-type qualifier, and show the file as if it was ascii, i.e. they print "A B C". They should recognize the BRF charset like other charsets (and for instance use iconv for converting it to unicode, and then display it just like any unicode text file), and thus print "⠁⠀⠃⠀⠉" instead of "A B C".

The BRF format defines bytes 0x00-0x1F as 1-to-1 equivalents to ascii 0x00-0x1F, and 0x20-0x5f as equivalents of 6-dot braille patterns of U+2800-U+283f.

BRF got added to IANA's list of charsets in 2006, see http://www.iana.org/assignments/charset-reg/BRF

BRF got added to glibc's iconv around the same period, see https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=localedata/charmaps/BRF;hb=HEAD

Regards,
Samuel

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