renderers: fix choosing best resolution
Merge pull request #3045 from FernetMenta/resfix

renderers: fix choosing best resolution
pvr: try SwtichChannel when selecting a channel via EPG
Correct typo
Merge pull request #3047 from CharlieMarshall/patch-1

Correct typo
Merge pull request #3046 from FernetMenta/pvrguide

pvr: try SwtichChannel when selecting a channel via EPG
[rbp] Add screenshot implementation that includes video layer

As Pi doesn't use GL for video, a screenshot only contains UI.
Need to use Pi specific function for screenshot.