### Description
Add `synopsis` comment as an alternative to description to vorbis
parser. Looks like some tools generate this instead of the more standard
comments.
Closes#8269
### Checklist
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- [x] I have performed a self-review of my code
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- [x] If it is a core feature, I have added automated tests
If a feed has a broken mime type that is not audio or video,
try to still use it as audio (if there is no audio yet).
This might lead to AP trying to play random other files that are not media files,
but it works around publishers messing up their mime types.
AntennaPod is quite slow with huge feeds. The reason is that we have a bunch of workarounds for misbehaving feeds that also make it slower to work with feeds that do not misbehave.
Changes:
- Only start guessing duplicate episodes when no "proper" match is found
- Only parse non-html as HTML for attributes that really need it
- Do not log failed Long parsing when size is not specified
- Try to parse dates with RFC822 first before falling back to workarounds for other formats
I ran a benchmark with "Stuff you should know" (for which the workarounds are not needed) containing 2k episodes. Includes download of 8MB of feed XML (~5 seconds), debug build.
Before: 44 seconds, after: 13 seconds ==> 3.4 times faster feed refresh
