- Remove configurable boundary that had never been working anyway (did not match the original value from MUX_GET_MIME)

the only demuxer supported is mpga, other demuxers should be updated if they demux files that can have id3v2 tags
fix some bugs in flac & ogg demuxers

input_ExtractAttachmentAndCacheArt(): use the attachment's mime type, don't use input_item_ functions as the input_item_t has been locked previously.

The idle HTTP interace is down from 30 to 10 wakeups/s (I think the remaining ones are due to HTTPd core).

 - Really yield the input (and release it) on a need-basis in the HTTP handler rather than in a custom thread. This is probably not thread-safe, but it's less unsafe than the previous code anyway.
This makes the HTTP interface thread very much useless, niark niark

LibVLC always creates the (singleton) playlist before the interfaces anyway.
Besides, the HTTP interface callbacks assumes the playlist is yield.
This removes one of two reasons for running the damn HTTP interface thread.

control/media_instance.c: Remove access to p_input_thread->p_internals. (which was a broken hack by the way).

input slave) Untested.
media_instance.c no longer depends on input_internal.h
Clean up a bit es_out pause handling.
Fixed DEMUX_GET_FPS description (double not float)