328. [func] Added isc_base64_decodestring().
(This is basically bin/named/server.c:base64_cstring_tobuffer(), which I will remove in another revision that will not need to be pulled up. I also would like to change isc_base64_totext() and isc_base64_tobuffer() to be isc_base64_encoderegion() and isc_base64_decodelexer(), unless there are exceptions. I find their existing names to be quite confusing with regard to what translation function each performs.)
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