Add all the Mac OS simple single-byte character sets from ftp.unicode.org.

Also add the older variants described there, and the character set used by
the "VT100" font (old and new).

Since RFC 1345 defines "macintosh" to refer to the currency-sign variant
of Mac OS Roman, update our table to match.

git-svn-id: svn://svn.tartarus.org/sgt/putty@2403 cda61777-01e9-0310-a592-d414129be87e