This also makes the bookmark-update event carry strings in UTF-8.
The only current consumer of that event is bookmark_change_hook(),
which ignores the strings, so no changes are needed there.
When the file is being read, Expat provides the strings to ELinks in
UTF-8, so ELinks can put them in struct bookmark without conversions.
Make sure gettext returns any placeholder strings in UTF-8, too.
Replace '\r' with ' ' in bookmark titles and URLs.
When the file is being written, put encoding="UTF-8" in the XML
declaration, and then write out the strings from struct bookmark
without character set conversions. Do replace some characters
with entity references though, by calling add_html_to_string().
When I first read the warning about "NO NATIONAL CHARS SUPPORT!"
I was amazed: XML is based on Unicode, so why would the authors of the
XBEL specification have botched support for those characters? The bug
is actually in the ELinks implementation of XBEL, and it has already
been entered in the ELinks bugzilla. Make the documentation string
refer to that.
Mostly non-ANSI function declarations, using 0 as NULL and inline
function prototypes. Also removed unused S_HTTP_100 network state
enum type, which text message contained unknown escape sequence: '\?'.
