htsp: another fix for H264 - headers merge

The real headers merge is in avc_convert_pkt() but this is called
only from the global headers plugin. Add the global headers plugin
to all HTSP chains.

This patch removes the merging from the TS parser.
WEBUI JS: cosmetic changes for dvr and epg dialogs
WEBUI JS: Aligh time properly in EPG/DVR dialogs
Fixed iconv handle type

Signed-off-by: Richard Kunze <richard.kunze@web.de>
epggrab: ota - om_complete load fix
DVR: Store episode string to storage, fixes #2357
DVR: Move freeing of some variables to dvr_entry_dec_ref()
Merge branch 'master' of https://github.com/tvheadend/tvheadend into iconv-fix