add option to only allow user to access the tag that matches username
webui: add icons to channel management functions
Merge remote-tracking branch 'origin/pr/333'
htsp dvr access: some updates to PR #333, plugs a few holes in access checks
Merge remote-tracking branch 'origin/pr/339'
Merge remote-tracking branch 'origin/pr/340'
Add esfilter (elementary stream filter)

Some feeds (especially from satellite) includes many language mutations
and other elementary streams. It may be useful to define the filters and
order scheme for the streaming and DVR.

See the included help file for more description.