ffmpeg demuxer: faster channel change for PVR addons without internal demuxing
(such as MediaPortal, ArgusTV, MythTV, NextPVR)
Credits: FernetMenta, Davilla, Popcornmix, Whaupt
ffmpeg demuxer: make sure we start mpegts video with an i-frame
DVDFactoryDemuxer: skip streaminfo for udp tcp and pvr-channels
IPlayer: let player know on close if it will be reopened
paplayer: instruct AE to keep configuration when skipping tracks
AE: add interface method KeepConfiguration
[pvr] observe PVRManager state to trigger epg create
ActiveAE: suspend hdmi audio during change of refresh rate
ActiveAE: fix port comparison  in state machine