Let's have it as it's common to be, which means top level src/ for
sources, single data/ for data, and so on.

<authentication>password-encrypted</authentication> apparently maps to
CRAM-MD5 for all server types (IMAP/POP3/SMTP), or at least that's how
Thunderbird interprets it.

Tarnyko authored Feb 26, 2014 and Milan Crha committed Feb 26, 2014

Win32 headers have a #define for 'interface', which breaks the build
when this word is used in the code, thus replace it to 'iface',
the same way as GLib or GTK+ code use to have it. (See bug #722068.)

Pass the built-in proxy ESource to SoupSession as a GProxyResolver.

Replaces EProxy usage, which is deprecated.

SoupSessionAsync and SoupSessionSync are deprecated in libsoup 2.42.

If we get a hit from the online database, parse the XML immediately and
store the results in generic internal structs.  Then when we're given an
ESource to populate we can feed it the stored results instead of parsing
the XML on demand (and repeatedly).

What this is really doing is making room for other auto-configuration
methods besides the online database lookup.

Use g_resolver_lookup_records() instead of parsing binary DNS records
ourselves (yuck!).  Also, realized what we really want are NS records
not MX records.  We just want the name server for a given domain.

The GVFS HTTP backend seems to just hang forever when an I/O operation
is cancelled.  Use libsoup instead.

See also: https://bugzilla.gnome.org/678615