Kodi-nfo-generator

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- added experimental extraction of episode information from JSON (if available), which
take precedence over information from HTML tags
- added experimental `--multi_episodes` flag, which outputs a `multi-episode.nfo` file
with all the episode details rather than one .nfo per episode
- the `--episode_pattern` option now allows specifying multiple patterns (e.g., `?x??*` and `??x??*`)

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- now checking whether `aria-label` attribute is present in rating tag for series
(https://github.com/fracpete/kodi-nfo-generator/issues/7)

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- now only downloading episode data for seasons that are also on disk rather than all
available ones

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- unescaping HTML entities in the JSON data when loading it

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- seasons can be extracted now from button-based navigation, as well as the older style
"select"-based one.
- episode data can be extract from episode-item-wrapper tags as well now

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- using `type` in JSON data to check whether episode data available (i.e., when `TVSeries`)