PVRRecording will update its m_resumePoint when GetLastPlayedPosition is called
GetResumeString no longer adds a resume bookmark in the video database
Implemented FileItem::IsResumePointSet and FileItem::GetCurrentResumePoint;
re-factored Application, relaxing const constraints due to the need to update in GetCurrentResumePoint;
re-factored CGUIDialogPVRGuideInfo::OnClickButtonSwitch because a temporary can't be passed by reference