First draft at the new object to maintain formerly-global state. (Not yet

First draft at the new object to maintain formerly-global state. (Not yet

	* libsoup/soup-session.c: First draft at the new object to
	maintain formerly-global state. (Not yet complete; still need to
	get rid of SoupContext).

	* libsoup/soup-message-queue.c: Data structure used by SoupSession

	* libsoup/soup-queue.c: Gone. Mostly moved into soup-session, but
	some bits went into soup-connection.

	* libsoup/soup-connection.c (soup_connection_send_request): New,
	to send a request on a connection. The connection updates its
	internal state and then hands off to soup_message_send_request.
	(request_done): Callback set up by soup_connection_send_request.
	Marks the connection as no-longer-in-use, and disconnects it if
	the message says to.
	(soup_connection_set_in_use, soup_connection_mark_old): No longer
	needed; the connection takes care of this itself now.
	(soup_connection_new_proxy): New, to create a new connection that
	is explicitly marked as being through an HTTP proxy.
	(soup_connection_new_tunnel): New, to create a new HTTPS
	connection through a proxy. (Includes the code to send the
	CONNECT.)

	* libsoup/soup-context.c (try_existing_connections): Don't need to
	call soup_connection_set_in_use.
	(try_create_connection): Use soup_connection_new,
	soup_connection_new_proxy, or soup_connection_new_tunnel as
	appropriate.

	* libsoup/soup-message.c (soup_message_prepare): Replaces
	queue_message.
	(soup_message_queue, soup_message_requeue, soup_message_prepare):
	Gone. This must be done via a SoupSession now.
	(soup_message_set_connection): don't need to mark in_use/not
	in_use. Also, msg->priv->socket is gone now.
	(soup_message_get_socket): Gone.

	* libsoup/soup-message-handlers.c (soup_message_run_handlers):
	Remove references to global handlers.
	(redirect_handler, authorize_handler): Moved to soup-session.c.

	* libsoup/soup-misc.c (soup_shutdown): Gone; just unref the
	session to shut down now.

	* libsoup/soup.h: add soup-session.h

	* libsoup/Makefile.am: updates

	* tests/auth-test.c, tests/get.c, tests/simple-proxy.c: Use
	SoupSession.