Adds CONFIG_ITEM_PASSWORD for showing stars in preferences dialog (still to be implemented in interfaces)

Only reload album art in the HTTP interface if the track id changes (or if the user clicks on the album art to force a reload).

* Allow getting album art for items which aren't playing (using /art?id=<the playlist id> instead of /art). (You need to run with --album-art 2 if you want to have album art for items which haven't already played)
* Workarround a stupid assert in input_GetItem.

Ogg/flac doesn't work (yet)

Also remove the volatile qualifier.
No, volatile does not magically solve threading bugs, sorry
I too have tried this "easy" path, it does REALLY NOT WORK.
volatile only solves signals concurrency, not threads concurrency.

By the way, using asprintf(&ptr)/free(ptr) to determine the length of a string
is really lame, when you can do the same with snprintf(NULL, 0);

Fix playlist_item_t.i_id vs input_item_t.i_id mess in HTTP interface. (Looks like this was new in 0.9.0. Having 2 differents integer ids, one being used to play and the other needed to delete the item is kind of awkward.)

Googleimage to use artist-tag and do url-encode (example taken from
http://www.redwiki.net/wiki/wiki.php/LUA/URLencode%B1%B8%C7%F6%C4ڵ%E5 )

Second try, show save meta button if user changes any input field, also
then set in_edit=true so playlist changes doesn't change meta-data what
to edit.

- Add rtcp boolean to emit RTCP SR

Edit mediainfo so you can edit meta-data even when playitem changes in
background. Also sets default to readonly, so user can't change meta if
he/she doesn't want to edit it. First try ;)

Patch by Ilkka Ollakka, modified by myself to rip-off extra spaces, to modify a constant one and not 4 times, and functions placement in the code.

Doesn't fix input memleaks (playlist.m:204-214)