pvr: Re-designed OSDs for channel,guide and guideinfo

This PR adds re-designed OSDs for channel, guide and guideinfo with extended information.
It can be enabled/disabled with a new skin setting found under LiveTV tab.

The guide info screen is removed, because of displaying all the epg
stuff in the channel/guide osd. Now the guide info osd only call the
record/add timer command and yes/no dialog appears immediately.