works with xtag for now due to lack of a DTD

read entire stream. make xml_ReaderValue return pcdata when available. Added
some more debug printfs when XTAG_DEBUG is defined.

 beos/*: use B_KEY_DOWN/B_KEY_UP messages instead of KeyDown()/KeyUp()
   so we can have access to the key code and be more reliable (fixes a
   bunch of hotkeys). Fixed snapshots (missing pf_control)

There are still other deadlocks in wx though

added a pf_destroy to stream_t, changed all various stream_FooDestroy to
stream_Delete

mkv.cpp: moved seek code in classes, improved support for cue-less files, improved cursor behaviour when seeking

- 7 memleaks fixed

(only works if something is playing ... and we have to fix the bug where
the image doesn't get updated like for the play/pause button)

wx/timer.cpp: show Now Playing in statusbar if available

the order of selection, patch by  Christophe Mutricy < xtophe -at-
nxtelevision dott com >

 standard access_t except that it reads from an access_t).

 * timeshift.c: timeshift access filter. It works with udp/dvb streams (tested
 under linux/windows).
 It allows to pause and to fast/slow forward. To try it, use
 --access-filter timeshift.