[PVR] initial support for sub channel numbers. display only. only works with 'using backend channel numbers' enabled
[PVR] bump add-ons
DXVA: factor out interface to dxva decoder into singleton
DXVA: only allow a single dxva decoder to be opened
DXVA: refcount decoder on get/release buffer
[pvr] fix destructor visibility to allow polymorphic deletion

This fixes the polymorphic deletion in CGUIWindowPVRBase.
Merge pull request #5290 from opdenkamp/subchannels

PVR: initial support for sub channel numbers
Merge pull request #5338 from xhaggi/pvr-fix-destructor-visibility

[pvr] fix destructor visibility to allow polymorphic deletion
Merge pull request #5335 from FernetMenta/dxva

DXVA: fixes related to ffmpeg
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
renderer: bump buffers to 5
videoplayer: update frametime, it might change due to fps detection
videoplayer: give streams with invalid fps a chance for fps detection
dvdplayer: allow rewinding at end of stream, do a seek after rewind
dvdplayer: observe pts counter overflow
dvdplayer: avoid short screen flicker caused by unnecessary reconfigure of renderer
vdpau: advanced settings for auto deinterlacing
player: fix rewind
fix incorrect display of fps when dr kicks in