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.

VLC_TimeSet: fixed overflow conversion from seconds to microseconds, this now allow to seek beyond 36 minutes

* Remove the ebuilds. Maintaining them downstream is easier. Current ebuilds are outdated and Gentoo is keeping them OK atm.

* Changed video-fiter to vout-filter, because video-filter will in the future be used for new style filters.

* changed the download location of libdvdread to download.videolan.org because www.dtek.chalmers.se keeps refusing any connections