Add "Rename" of channels based on regex

[mike-pt]

Is your feature request related to a problem? Please describe.
This would be handy for PMS when we want to use Plex built-in EPG

I have IPTV service that includes channels that are actually available in plex EPG, but they are not auto matched because the IPTV m3u add prefixes to all channels which is quite annoying

Describe the solution you'd like
Since mapping won't work with "PMS" as a EPG option, it would be nice to be able to "rename" these before they get saved into the data the xteve will provide to PMS DVR

i.e. I have a few that have "[EU| NEWS 4K" as prefix... If I get rid of this they would just auto match in PMS

If we could somehow 's/[EU| NEWS 4K//g' this would be solved