[pvr] refactor: define map and iterator types for epg container
[pvr] refactor: use map to improve recording lookup in recordings container
[pvr] refactor: use std::string for recording id to avoid implicit casts
[pvr] cosmetics: fix minor typos in comments
[pvr] add optional support for playing recordings from epg timeline or epg osd
[confluence] add "has recording" marker to programmes having associated recordings in epg timeline view, epg osd and programme search results