Improve parsing of --defaults.

- Add FromYAML instances to Opt and to all subsidiary types.
- Remove the use of HsYAML-aeson, which doesn't give good
  position information on errors.
- Rename some fields in Opt to better match cli options or
  reflect what the ycontain [API change]:

  + optMetadataFile -> optMetadataFiles
  + optPDFEngineArgs -> optPDFEngineOpts
  + optWrapText -> optWrap
- Add IpynbOutput enumerated type to Text.Pandoc.App.Opts.
  Use this instead fo a string for optIpynbOutput.
- Add FromYAML instance for Filter in Text.Pandoc.Filters.

With these changes parsing of defaults files should be
complete and should give decent error messages.

Now (unlike before) we get an error if an unknown field
is used.

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