Kodi-nfo-generator

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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`)

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- using `download-missing` no longer generates `Ignoring unhandled fanart type: download-missing`
message when fanart already present (just an output bug).
- improved checks for existing `.nfo` files to reduce IMDB requests
- added `kodi-nfo-rename` tool for renaming files using regular expressions
(e.g., files of TV shows)
- the `kodi-nfo-gen` tool now has additional options for matching episode files
rather than using hardcoded defaults: `--episode_pattern`, `--season_group`,
`--episode_group`.