VDR channels proxy that allows to reorder channels using an external
script or program.
Use XVDRChannels instead of Channels.
Added new configuration parameter to xvdr.conf.
do not detach / attach receiver on creating demuxers
fixed channel switching with cold caches
preload cache with VDR channel information

- channel info preloading
- caching improvements
Revert "preload cache with VDR channel information" - wrong push

This reverts commit 354deb1c3c4eece8e75728bd2d5c9d9e64e6853f.
preload cache with VDR channel information - corrected

- remove invalid entries from the cache
- channel info preloading
- caching improvements
- do not stop streamer if streams change
- fixed reading / writing channel cache
fixed cached subtitle streams
Merge branch 'reorder' of https://github.com/AndreyPavlenko/vdr-plugin-xvdr
use new XVDRChannels in LoadChannelCacheData()