Allow users to customize the segment queue timing threshold which checks
whether to stop the stream early if no new segments were queued after
the playlist's target-duration multiplied by the queue-threshold-factor
has passed.

Increase the default value from 2 to 3, so that the default
configuration doesn't unnecessarily cause issues in certain live streams
where the connection of the broadcaster is unstable and the streaming
provider doesn't or can't queue new segments.

Try to keep this value reasonably low, so we can still stop streams
early when the `EXT-X-ENDLIST` tag is missing.

Wait for at least 5 seconds before stopping early, regardless of
the playlist's targetduration and hls-segment-queue-threshold value

- Fix options regex
  - parse all alphanumerical options with dashes
  - be more strict around the option-value operator
    and properly ignore invalid option formats, just like comments
- Fix parsing of shorthand options
- Add tests

Try to drain the stdout/stderr streams first before handling
the onexit task, so the overall result can be processed correctly

Co-Authored-By: bastimeyer <mail@bastimeyer.de>

- Add support for floats via `hours_minutes_seconds_float()`
- Add support for negative timestamps
- Rewrite regexes and be as strict as possible
- Rewrite and parametrize tests with an extensive list of formats
- Update cli.argparser/plugin arguments using `hours_minutes_seconds()`

- Add code examples
- Reword paragraphs
- Fix missing parenthesis