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We're using version 1.1 of Mozilla's ClientConfig format now.  These
files are all version 1.0.  But even aside from that, offline autoconfig
is not compelling enough to warrant maintaining two copies of this data.

Obsoleted by EMailAutoconfig.

Obsoleted by EBookSourceConfig and ECalSourceConfig.

This breaks a good chunk of logic out of EMAccountEditor and hopefully
makes it less brittle.  Because honestly, every time I fix one thing in
EMAccountEditor it breaks three other things.  It's unmaintainable.

Adds an extra page to EMailConfigNotebook for 'imap' accounts.

Replaces the 'imap-features' plugin.

Registers the "On The Web" backend in ECalSourceConfig widgets.

Replaces the 'calendar-http' plugin.

Registers the "Weather" backend in ECalSourceConfig widgets.

Replaces the 'calendar-weather' plugin.

Registers the "Google" backend in ECalSourceConfig widgets.

Replaces the 'google-account-setup' plugin.

Registers the "Contacts" backend in ECalSourceConfig widgets.

Registers the "CalDAV" backend in ECalSourceConfig widgets.

Replaces the 'caldav' plugin.

Registers the "On This Computer" backend in ECalSourceConfig widgets.

Replaces the 'calendar-file' plugin.

Registers the "WebDAV" backend in EBookSourceConfig widgets.

Replaces the 'webdav-account-setup' plugin.

Register the "On LDAP Servers" backend in EBookSourceConfig widgets.

Register the "Google" backend in EBookSourceConfig widgets.

Partially replaces the 'google-account-setup' plugin.

Registers the "On This Computer" backend in EBookSourceConfig widgets.

Replaces the 'addressbook-file' plugin.

Replaces the 'backup-restore' plugin.