Recording enhancements

[emveepee]

Recording changes

I. General

• reload recordings and reset modification time when a settings change impacts recordings
• delete recording channel json cache to allow for changes outside of Jellyfin. JF only calls for new recordings when the database entries are not cached
• use episode mode without S/E for all non movie recordings, Jellyfin was using the subtitle as title and not displaying the title on clips.
• parse duplicated S/E information from the sub-title passed in the API.
• change cache key, add-on was using a key that changed often, leaving orphan JSON in the cache for every recording

II. Recording polling

In 10.9 Jellyfin was re-enabling disabled plugin causing user performance issues (not sure why though)

• don't poll for recording until connected
• reduce initial connection time to 5 seconds to avoid overlapping connection attempts
• allow configuration of polling interval, the more frequent the more responsive the addon is to changes outside Jellyfin
• catch connection errors in the plugin, don't throw errors to core.

III. In-progress recordings problems

a) In-progress recordings do not play when recordings are flagged as in-progress

• default in-progress to direct play.
• append growing flag to recordings to not send content-length.

b) No resume while in-progress

• don't know what to do to make this work.

c) Slow playback on initial in-progress recordings

• cannot change the analyzeduration so FFprobe waits for 200MB before playback
• if users give up, orphan FFmpeg tasks could be left running.
• don't know what to do to make this work.

IV. Security changes

• configure IPv4 so FFmpeg doesn't use IPv6 when a hostname is specified
• adapt to NextPVR unauthenticated access fix starting in 6.1.6
• allow unauthenticated recording streaming so clients can direct play. Jellyfin does not proxy client so security was failing and only transcoded play was available.

[emveepee]

@crobibero note that there are some things in this patch that don't fix in-progress recordings so any suggestions would be helpful before merging.

I can break this into multiple commits if it will help, but I can't guarantee that the will work on their own.