First batch of disconnected IMAP-related stuff. This adds local

	caching of message parts, but NOT any actual disconnected support.
	(But it should speed up IMAP use.)

	* providers/imap/camel-imap-message-cache.c: New class for caching
	message data to disk, and removing it when it's no longer
	relevant. Will eventually also support merging message parts
	together to save on files. Or maybe using a db instead of files?

	* providers/imap/camel-imap-private.h: Add a cache_lock to
	CamelImapFolderPrivate. This lock must be recursive, so make both
	locks EMutexes rather than GMutex.

	* providers/imap/camel-imap-folder.c (parse_fetch_response): "The
	only FETCH response parser you need!" Replaces the various
	almost-correct bits of code formerly scattered throughout this
	file with a single fully-correct function that can handle any
	FETCH response at any time, so we don't get confused by seeing a
	flags update when we were only expecting a message body, etc.
	(camel_imap_folder_fetch_data): FETCH a message body part either
	from the cache or the server
	(camel_imap_folder_changed): Remove expunged messages from the
	message cache.
	(camel_imap_folder_new): Change to take a directory instead of a
	summary file name. Create a CamelImapMessageCache for the folder.
	(imap_finalize): Unref the message cache.
	(camel_imap_folder_selected, imap_rescan, get_content,
	get_message, imap_get_message, imap_update_summary): Redone a
	bunch to use parse_fetch_data, CamelImapMessageCache, etc.

	* providers/imap/camel-imap-store.c (get_folder): Pass directory
	name to camel_imap_folder_new, not summary filename. Use
	e_path_to_physical to generate a path with /subfolders/ inserted
	between directory components.

	* providers/imap/camel-imap-wrapper.c (camel_imap_wrapper_new):
	Call camel_imap_folder_fetch_data (with cache_only TRUE) and if
	the data is cached, return an online datawrapper rather than an
	offline one.
	(write_to_stream): Use camel_imap_folder_fetch_data (with
	cache_only FALSE) here too

	* providers/imap/camel-imap-utils.c (imap_skip_list): Renamed from
	skip_list and made non-static.

svn path=/trunk/; revision=8743

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