EVR-CP: Restart worker threads when resetting the device.

Fixes a crash when switching VSync modes caused by a442540b53b8a040ec0cfd95fce6743922ac386f. But instead of just restarting the VSync thread, all threads are now safely restarted.
DVB Header information for video streams

Added header information from PMT tables for MPEG-2 and H.264 Streams. The switching channel approach had to be reviewed as well.
Minimized the number of windows size changes each time a channel is switched

Signed-off-by: xpc1000 <xavier_portell@hotmail.com>
DVB: Add "No subtitles" to the stream selection menu.
Subtitles are disabled by default now.