RPC::XML uses ascii as default encoding, we have to tell it to use utf8.
Without this, ikiwiki returns "failed to get response from blogspam server"
every time a non-ascii character is used in a content that needs checking.
I also tried setting RPC::XML::ENCODING but that did not prevent the crash,
and it seems that blogspam.net doesn't like getting xml encoded in unicode,
since it mis-flagged comments as spammy that way that are normally allowed
through.
Everywhere that REMOTE_ADDR was used, a session object is available, so
instead use its remote_addr method.
In IkiWiki::Receive, stop setting a dummy REMOTE_ADDR.
Note that it's possible for a session cookie to be obtained using one IP
address, and then used from another IP. In this case, the first IP will now
be used. I think that should be ok.
Always pass the full (modified) content in `content` named parameter. When the
user edits an existing wiki page, also pass a `diff` named parameter, which
includes only the lines that they added to the page, or modified.
Signed-off-by: intrigeri <intrigeri@boum.org>