Change JSON encodings of some types.

- For LineEnding use lowercase constructors, e.g. `crlf`, `native`.
  This was the original intent, but there was a bug in the
  implementation.
- For HTMLSlideVariant use lowercase constructors.
- For ReaderOptions use e.g. `default-image-extension`
  instead of `readerDefaultImageExtension` for field names.
- For Extension, use e.g. `tex_math_dollars` instead of
  `Ext_tex_math_dollars` as constructor.
- For Extensions, use an array of Extensions, instead of
  an object wrapping the tag `Extensions` and an integer.
  (The representation is not supposed to be part of the
  public API.)
- For Opt, use field names like `tab-stop` instead of `optTabStop`.

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