General cleanup.

General cleanup.

According to the WikiRPC spec, all of the returned
string values (or at least those which might contain non-ascii characters)
need to be converted to UTF-8.  Then short strings (e.g. page names
and authors) are to be rawurlencode()d an returned as XML-RPC string
values, while long strings (e.g. page content) are to be returned as
XML-RPC base64 values.

A lot of this was being done inconsistently or not at all --- I've just
gone through and made sure everything gets properly encoded.

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@2318 96ab9672-09ca-45d6-a79d-3d69d39ca109