udp: multipacket - add NULL checks
iptv: udp - fix the mutex protection for the stop callback
For comment: concept of filtering EPG on duration
WebUI: Add programme duration filtering
WebUI: Add programme duration filtering
WebUI: Add programme duration filtering
WebUI: Add programme duration filtering
WebUI: Grid validation on programme duration filtering
WebUI: Add programme duration filtering
WebUI: Add programme duration filtering
WebUI: Add programme duration filtering
WebUI: Duration filter - improved validation on autorec grid
WebUI: Revert duration filter to comboboxes
webui: standardise duration filter options between epg and autorec
webui: add clear filter option to all individual EPG filters
webui: implement filter-specific clear options into autorec grid plus combo cosmetics
webui: code cosmetics (place fields in the same order as the store)
code cosmetics
webui: Update EPG help files for duration filter et al
webui: Update DVR help files