mpg123 scan files faster
add file descriptor to guess media profile
create stream seekable to check files properties and play stream

dlna_stream_t new structure with read, lseek callback.
This structure is create by the libdlna and passed to the profiler.
The profiler has to use the callbacks to parse the files and checks the contain.
When all profilers used the stream, libdlna close this one before to check another stream.
current track rtime computation
use item properties to setup the output of mpg123 profiler
open only one sound instance inside mpg123 profiler
check file extension to retrieve mime type and the profiler
Merge branch 'pos_info_rtime' into integration

Conflicts:
	mpg123_profiler/profiles.c