teletext parser: fix national character translation

- the national number must be bit-reversed
- add support for more character variations
webui: set title for the Play links (... playlists)
capmt: Fix the filter comparison (thanks manio)
parser_teletext: Srbski -> Srpski typo fix
webui: sort channel m3u playlist by channel number and name
muxer_pass: Change PAT and PMT rewriting code so that it does not modify the TS packets in-place.  These are shared buffers (with other subscriptions to the same service) and was causing CC errors in the PAT packets when there were multiple simultaneous subscriptions to the same service using TS passthrough.  Initial patch by adamsutton - see recent IRC logs.
Merge remote-tracking branch 'upstream/master' into durationfilter