imgstore: unref msn
imgstore: unref mxit
imgstore: unref oscar
PurpleImage: better reference management
PurpleImage: use purple_image_store_get_from_uri where possible
imgstore: unref sametime
imgstore: unref silc; fix inline images in silc
imgstore: unref yahoo
imgstore has no more refs, drop it
Mxit: tiny image tweak
Drop purple_util_get_image_extension and purple_util_get_image_filename
Drop remote smileys in favor of remote images
Drop purple_smiley_get_path in favor of purple_image_get_path (or don't use it at all)
PurpleImage: drop get_image class callback and path property
Webkit: preserve file names for inline images and smileys
Fix possible NULL dereference
Gadu-Gadu: use remote features of PurpleImage instead of handling image queue
Gadu-Gadu: add missing verbose block