PVR: Resolve channel dummy in GUIWindowPVRTimerSettings

When using Backend channel number , use channel unique ID member instead channel number
PVR: Cosmetics in GUIWindowPVRTimerSettings
CFile: fix null pointer dereference in Stat() and Write()
[vfs] CFile: add null pointers checks
[rbp/omxplayer] Use an omx decode to texture pipeline

This PR uses an openmax pipeline to handle jpeg decode/resize/convert to texture without the decoded pixels being returned to the arm.

The jpeg is decoded in stripes which saves memory. There is no need for the RGBA32 pixel buffer to ever exist on the arm.
It is straightforward to choose whether the textures are 16bpp or 32bpp which could be a useful option on 256M Pi.

This scheme is *much* faster, and is the main factor in the recent raspberry-pi "speed" video.
It is well tested and openelec and raspbmc builds have been made with this patch in.
[rbp/omxplayer] remove resume players on CloseFile, fixes some small portion of audio being played when stopping a paused video
[rbp/omxplayer] Add external subs' details while updating stream details from player.
[rbp/omxplayer] update current video settings when changing setting subtitles stream to be sure we keep it synced (similiar to what we already do when we show/hide subtitles)
[rbp/omxplayer] Use CUtil::GetExternalStreamDetailsFromFilename to determine external subtitles's details.
These are language, name and flag.
[rbp/omxplayer] Allow the use of external subtitles for DVDs
[rbp/omxplayer] allow external .sub subtitles next to text-based ones
[rbp/omxplayer] allow setting the video's stereo scopic mode from video settings
[rbp/omxplayer] Unpause (if applicable) when going to DVD menu
[rbp/omxplayer] Add busydialogdelayms advanced setting.
[rbp/omxplayer] Take advantage of if evaluation order.
[rbp/omxplayer] Remove unnecessary NULL check.
[rbp/omxplayer] Set CMediaSettings::Get().GetCurrentVideoSettings().m_AudioStream on open/set.
[rbp/omxplayer] Save the subtitle number at the end of the OpenSubtitleStream() method.
Regardless of whether the subtitle has been opened successfully or not.
[rbp/omxplayer] prune from usage of DWORD and BYTE typedefs
[rbp/omxplayer] Fix (harmless) typo with video/audio fifo levels